diff --git a/src/client/clientenvironment.cpp b/src/client/clientenvironment.cpp
index b9bb82bdf..af815c015 100644
--- a/src/client/clientenvironment.cpp
+++ b/src/client/clientenvironment.cpp
@@ -182,7 +182,7 @@ void ClientEnvironment::step(float dtime)
 		Stuff that has a maximum time increment
 	*/
 
-	u32 steps = ceil(dtime / dtime_max_increment);
+	u32 steps = std::ceil(dtime / dtime_max_increment);
 	f32 dtime_part = dtime / steps;
 	for (; steps > 0; --steps) {
 		/*
diff --git a/src/client/clientmap.cpp b/src/client/clientmap.cpp
index cc2ed6516..45995c0ea 100644
--- a/src/client/clientmap.cpp
+++ b/src/client/clientmap.cpp
@@ -1305,7 +1305,7 @@ void ClientMap::updateTransparentMeshBuffers()
 	ScopeProfiler sp(g_profiler, "CM::updateTransparentMeshBuffers", SPT_AVG);
 	u32 sorted_blocks = 0;
 	u32 unsorted_blocks = 0;
-	f32 sorting_distance_sq = pow(m_cache_transparency_sorting_distance * BS, 2.0f);
+	f32 sorting_distance_sq = std::pow(m_cache_transparency_sorting_distance * BS, 2.0f);
 
 
 	// Update the order of transparent mesh buffers in each mesh
diff --git a/src/client/content_cao.cpp b/src/client/content_cao.cpp
index d80869d9c..7e8dfaeb2 100644
--- a/src/client/content_cao.cpp
+++ b/src/client/content_cao.cpp
@@ -1216,7 +1216,7 @@ void GenericCAO::step(float dtime, ClientEnvironment *env)
 		}
 	}
 
-	if (node && fabs(m_prop.automatic_rotate) > 0.001f) {
+	if (node && std::abs(m_prop.automatic_rotate) > 0.001f) {
 		// This is the child node's rotation. It is only used for automatic_rotate.
 		v3f local_rot = node->getRotation();
 		local_rot.Y = modulo360f(local_rot.Y - dtime * core::RADTODEG *
diff --git a/src/client/game.cpp b/src/client/game.cpp
index 3f83b0278..ea686ddbc 100644
--- a/src/client/game.cpp
+++ b/src/client/game.cpp
@@ -2648,7 +2648,7 @@ f32 Game::getSensitivityScaleFactor() const
 	// Multiply by a constant such that it becomes 1.0 at 72 degree FOV and
 	// 16:9 aspect ratio to minimize disruption of existing sensitivity
 	// settings.
-	return tan(fov_y / 2.0f) * 1.3763818698f;
+	return std::tan(fov_y / 2.0f) * 1.3763819f;
 }
 
 void Game::updateCameraOrientation(CameraOrientation *cam, float dtime)
@@ -2711,8 +2711,8 @@ void Game::updatePlayerControl(const CameraOrientation &cam)
 			client->activeObjectsReceived() && !player->isDead()) {
 		control.movement_speed = 1.0f;
 		// sideways movement only
-		float dx = sin(control.movement_direction);
-		control.movement_direction = atan2(dx, 1.0f);
+		float dx = std::sin(control.movement_direction);
+		control.movement_direction = std::atan2(dx, 1.0f);
 	}
 
 	/* For touch, simulate holding down AUX1 (fast move) if the user has
@@ -4250,14 +4250,14 @@ void Game::updateShadows()
 	if (!shadow)
 		return;
 
-	float in_timeofday = fmod(runData.time_of_day_smooth, 1.0f);
+	float in_timeofday = std::fmod(runData.time_of_day_smooth, 1.0f);
 
 	float timeoftheday = getWickedTimeOfDay(in_timeofday);
 	bool is_day = timeoftheday > 0.25 && timeoftheday < 0.75;
 	bool is_shadow_visible = is_day ? sky->getSunVisible() : sky->getMoonVisible();
 	shadow->setShadowIntensity(is_shadow_visible ? client->getEnv().getLocalPlayer()->getLighting().shadow_intensity : 0.0f);
 
-	timeoftheday = fmod(timeoftheday + 0.75f, 0.5f) + 0.25f;
+	timeoftheday = std::fmod(timeoftheday + 0.75f, 0.5f) + 0.25f;
 	const float offset_constant = 10000.0f;
 
 	v3f light = is_day ? sky->getSunDirection() : sky->getMoonDirection();
diff --git a/src/client/joystick_controller.cpp b/src/client/joystick_controller.cpp
index 19626d24e..5acb0b751 100644
--- a/src/client/joystick_controller.cpp
+++ b/src/client/joystick_controller.cpp
@@ -318,12 +318,14 @@ float JoystickController::getAxisWithoutDead(JoystickAxis axis)
 
 float JoystickController::getMovementDirection()
 {
-	return atan2(getAxisWithoutDead(JA_SIDEWARD_MOVE), -getAxisWithoutDead(JA_FORWARD_MOVE));
+	return std::atan2(getAxisWithoutDead(JA_SIDEWARD_MOVE),
+			-getAxisWithoutDead(JA_FORWARD_MOVE));
 }
 
 float JoystickController::getMovementSpeed()
 {
-	float speed = sqrt(pow(getAxisWithoutDead(JA_FORWARD_MOVE), 2) + pow(getAxisWithoutDead(JA_SIDEWARD_MOVE), 2));
+	float speed = std::sqrt(std::pow(getAxisWithoutDead(JA_FORWARD_MOVE), 2) +
+			std::pow(getAxisWithoutDead(JA_SIDEWARD_MOVE), 2));
 	if (speed > 1.0f)
 		speed = 1.0f;
 	return speed;
diff --git a/src/client/localplayer.cpp b/src/client/localplayer.cpp
index 6e5458c8a..1470d819a 100644
--- a/src/client/localplayer.cpp
+++ b/src/client/localplayer.cpp
@@ -600,7 +600,8 @@ void LocalPlayer::applyControl(float dtime, Environment *env)
 		}
 	}
 
-	speedH = v3f(sin(control.movement_direction), 0.0f, cos(control.movement_direction));
+	speedH = v3f(std::sin(control.movement_direction), 0.0f,
+			std::cos(control.movement_direction));
 
 	if (m_autojump) {
 		// release autojump after a given time
diff --git a/src/client/shadows/dynamicshadowsrender.cpp b/src/client/shadows/dynamicshadowsrender.cpp
index f88b0fa3b..fc8592a21 100644
--- a/src/client/shadows/dynamicshadowsrender.cpp
+++ b/src/client/shadows/dynamicshadowsrender.cpp
@@ -171,8 +171,8 @@ f32 ShadowRenderer::getMaxShadowFar() const
 
 void ShadowRenderer::setShadowIntensity(float shadow_intensity)
 {
-	m_shadow_strength = pow(shadow_intensity, 1.0f / m_shadow_strength_gamma);
-	if (m_shadow_strength > 1E-2)
+	m_shadow_strength = std::pow(shadow_intensity, 1.0f / m_shadow_strength_gamma);
+	if (m_shadow_strength > 1e-2f)
 		enable();
 	else
 		disable();
diff --git a/src/client/sky.cpp b/src/client/sky.cpp
index e2f828605..12eb7f0e8 100644
--- a/src/client/sky.cpp
+++ b/src/client/sky.cpp
@@ -680,7 +680,7 @@ void Sky::draw_stars(video::IVideoDriver * driver, float wicked_time_of_day)
 
 	float tod = wicked_time_of_day < 0.5f ? wicked_time_of_day : (1.0f - wicked_time_of_day);
 	float day_opacity = clamp(m_star_params.day_opacity, 0.0f, 1.0f);
-	float starbrightness = (0.25f - fabs(tod)) * 20.0f;
+	float starbrightness = (0.25f - std::abs(tod)) * 20.0f;
 	float alpha = clamp(starbrightness, day_opacity, 1.0f);
 
 	m_star_color = m_star_params.starcolor;
diff --git a/src/server/luaentity_sao.cpp b/src/server/luaentity_sao.cpp
index 3995f656d..ae5c97bfd 100644
--- a/src/server/luaentity_sao.cpp
+++ b/src/server/luaentity_sao.cpp
@@ -203,7 +203,7 @@ void LuaEntitySAO::step(float dtime, bool send_recommended)
 		}
 	}
 
-	if (fabs(m_prop.automatic_rotate) > 0.001f) {
+	if (std::abs(m_prop.automatic_rotate) > 0.001f) {
 		m_rotation_add_yaw = modulo360f(m_rotation_add_yaw + dtime * core::RADTODEG *
 				m_prop.automatic_rotate);
 	}
diff --git a/src/tileanimation.cpp b/src/tileanimation.cpp
index bbccfbaa1..53ae264af 100644
--- a/src/tileanimation.cpp
+++ b/src/tileanimation.cpp
@@ -31,11 +31,11 @@ void TileAnimationParams::serialize(std::ostream &os, u16 protocol_ver) const
 	if (type == TAT_VERTICAL_FRAMES) {
 		writeU16(os, vertical_frames.aspect_w);
 		writeU16(os, vertical_frames.aspect_h);
-		writeF32(os, need_abs ? fabs(vertical_frames.length) : vertical_frames.length);
+		writeF32(os, need_abs ? std::abs(vertical_frames.length) : vertical_frames.length);
 	} else if (type == TAT_SHEET_2D) {
 		writeU8(os, sheet_2d.frames_w);
 		writeU8(os, sheet_2d.frames_h);
-		writeF32(os, need_abs ? fabs(sheet_2d.frame_length) : sheet_2d.frame_length);
+		writeF32(os, need_abs ? std::abs(sheet_2d.frame_length) : sheet_2d.frame_length);
 	}
 }