diff --git a/src/cavegen.cpp b/src/cavegen.cpp
index 51af50984..71f005d5b 100644
--- a/src/cavegen.cpp
+++ b/src/cavegen.cpp
@@ -236,6 +236,9 @@ void CaveV6::carveRoute(v3f vec, float f, bool randomize_xz) {
 					continue;
 
 				u32 i = vm->m_area.index(p);
+				content_t c = vm->m_data[i].getContent();
+				if (!ndef->get(c).is_ground_content)
+					continue;
 
 				if (large_cave) {
 					int full_ymin = node_min.Y - MAP_BLOCKSIZE;
@@ -250,7 +253,6 @@ void CaveV6::carveRoute(v3f vec, float f, bool randomize_xz) {
 					}
 				} else {
 					// Don't replace air or water or lava or ignore
-					content_t c = vm->m_data[i].getContent();
 					if (c == CONTENT_IGNORE || c == CONTENT_AIR ||
 						c == c_water_source || c == c_lava_source)
 						continue;
@@ -530,8 +532,8 @@ void CaveV7::carveRoute(v3f vec, float f, bool randomize_xz, bool is_ravine) {
 				
 				// Don't replace air, water, lava, or ice
 				content_t c = vm->m_data[i].getContent();
-				if (c == CONTENT_AIR   || c == c_water_source ||
-					c == c_lava_source || c == c_ice)
+				if (!ndef->get(c).is_ground_content || c == CONTENT_AIR ||
+					c == c_water_source || c == c_lava_source || c == c_ice)
 					continue;
 					
 				if (large_cave) {
diff --git a/src/mapnode.cpp b/src/mapnode.cpp
index a47a48bc0..d52677be0 100644
--- a/src/mapnode.cpp
+++ b/src/mapnode.cpp
@@ -383,8 +383,10 @@ u8 MapNode::getLevel(INodeDefManager *nodemgr) const
 		return getParam2() & LIQUID_LEVEL_MASK;
 	if(f.leveled || f.param_type_2 == CPT2_LEVELED) {
 		 u8 level = getParam2() & LEVELED_MASK;
-		 if(level) return level;
-		 if(f.leveled > LEVELED_MAX) return LEVELED_MAX;
+		 if(level)
+			return level;
+		 if(f.leveled > LEVELED_MAX)
+		 	return LEVELED_MAX;
 		 return f.leveled; //default
 	}
 	return 0;
@@ -398,7 +400,7 @@ u8 MapNode::setLevel(INodeDefManager *nodemgr, s8 level)
 		return 0;
 	}
 	const ContentFeatures &f = nodemgr->get(*this);
-	if (	   f.param_type_2 == CPT2_FLOWINGLIQUID
+	if (f.param_type_2 == CPT2_FLOWINGLIQUID
 		|| f.liquid_type == LIQUID_FLOWING
 		|| f.liquid_type == LIQUID_SOURCE) {
 		if (level >= LIQUID_LEVEL_SOURCE) {
@@ -487,8 +489,7 @@ void MapNode::deSerialize(u8 *source, u8 version)
 		param0 = readU16(source+0);
 		param1 = readU8(source+2);
 		param2 = readU8(source+3);
-	}
-	else{
+	}else{
 		param0 = readU8(source+0);
 		param1 = readU8(source+1);
 		param2 = readU8(source+2);
diff --git a/src/nodedef.cpp b/src/nodedef.cpp
index 41956ca2e..d13d0653d 100644
--- a/src/nodedef.cpp
+++ b/src/nodedef.cpp
@@ -396,15 +396,16 @@ public:
 		// Set CONTENT_AIR
 		{
 			ContentFeatures f;
-			f.name = "air";
-			f.drawtype = NDT_AIRLIKE;
-			f.param_type = CPT_LIGHT;
-			f.light_propagates = true;
+			f.name                = "air";
+			f.drawtype            = NDT_AIRLIKE;
+			f.param_type          = CPT_LIGHT;
+			f.light_propagates    = true;
 			f.sunlight_propagates = true;
-			f.walkable = false;
-			f.pointable = false;
-			f.diggable = false;
-			f.buildable_to = true;
+			f.walkable            = false;
+			f.pointable           = false;
+			f.diggable            = false;
+			f.buildable_to        = true;
+			f.is_ground_content   = true;
 			// Insert directly into containers
 			content_t c = CONTENT_AIR;
 			m_content_features[c] = f;
@@ -414,16 +415,16 @@ public:
 		// Set CONTENT_IGNORE
 		{
 			ContentFeatures f;
-			f.name = "ignore";
-			f.drawtype = NDT_AIRLIKE;
-			f.param_type = CPT_NONE;
-			f.light_propagates = false;
+			f.name                = "ignore";
+			f.drawtype            = NDT_AIRLIKE;
+			f.param_type          = CPT_NONE;
+			f.light_propagates    = false;
 			f.sunlight_propagates = false;
-			f.walkable = false;
-			f.pointable = false;
-			f.diggable = false;
-			// A way to remove accidental CONTENT_IGNOREs
-			f.buildable_to = true;
+			f.walkable            = false;
+			f.pointable           = false;
+			f.diggable            = false;
+			f.buildable_to        = true; // A way to remove accidental CONTENT_IGNOREs
+			f.is_ground_content   = true;
 			// Insert directly into containers
 			content_t c = CONTENT_IGNORE;
 			m_content_features[c] = f;