diff --git a/src/mapgen/mapgen.cpp b/src/mapgen/mapgen.cpp
index e26b0c9fa..791c56609 100644
--- a/src/mapgen/mapgen.cpp
+++ b/src/mapgen/mapgen.cpp
@@ -131,9 +131,15 @@ Mapgen::Mapgen(int mapgenid, MapgenParams *params, EmergeParams *emerge) :
 	*/
 	seed = (s32)params->seed;
 
+	m_emerge  = emerge;
 	ndef      = emerge->ndef;
 }
 
+Mapgen::~Mapgen()
+{
+	delete m_emerge; // this is our responsibility
+}
+
 
 MapgenType Mapgen::getMapgenType(const std::string &mgname)
 {
@@ -566,7 +572,6 @@ void Mapgen::spreadLight(const v3s16 &nmin, const v3s16 &nmax)
 MapgenBasic::MapgenBasic(int mapgenid, MapgenParams *params, EmergeParams *emerge)
 	: Mapgen(mapgenid, params, emerge)
 {
-	this->m_emerge = emerge;
 	this->m_bmgr   = emerge->biomemgr;
 
 	//// Here, 'stride' refers to the number of elements needed to skip to index
@@ -620,8 +625,6 @@ MapgenBasic::MapgenBasic(int mapgenid, MapgenParams *params, EmergeParams *emerg
 MapgenBasic::~MapgenBasic()
 {
 	delete []heightmap;
-
-	delete m_emerge; // destroying EmergeParams is our responsibility
 }
 
 
diff --git a/src/mapgen/mapgen.h b/src/mapgen/mapgen.h
index b61608039..b1d1a1bf0 100644
--- a/src/mapgen/mapgen.h
+++ b/src/mapgen/mapgen.h
@@ -163,6 +163,9 @@ public:
 	int id = -1;
 
 	MMVManip *vm = nullptr;
+	// Note that this contains various things the mapgens *can* use, so biomegen
+	// might be NULL while m_emerge->biomegen is not.
+	EmergeParams *m_emerge = nullptr;
 	const NodeDefManager *ndef = nullptr;
 
 	u32 blockseed;
@@ -175,7 +178,7 @@ public:
 
 	Mapgen() = default;
 	Mapgen(int mapgenid, MapgenParams *params, EmergeParams *emerge);
-	virtual ~Mapgen() = default;
+	virtual ~Mapgen();
 	DISABLE_CLASS_COPY(Mapgen);
 
 	virtual MapgenType getType() const { return MAPGEN_INVALID; }
@@ -289,7 +292,6 @@ public:
 	virtual void generateDungeons(s16 max_stone_y);
 
 protected:
-	EmergeParams *m_emerge;
 	BiomeManager *m_bmgr;
 
 	Noise *noise_filler_depth;
diff --git a/src/mapgen/mapgen_singlenode.cpp b/src/mapgen/mapgen_singlenode.cpp
index 3a4199035..1a6cba6b0 100644
--- a/src/mapgen/mapgen_singlenode.cpp
+++ b/src/mapgen/mapgen_singlenode.cpp
@@ -32,8 +32,6 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 MapgenSinglenode::MapgenSinglenode(MapgenParams *params, EmergeParams *emerge)
 	: Mapgen(MAPGEN_SINGLENODE, params, emerge)
 {
-	const NodeDefManager *ndef = emerge->ndef;
-
 	c_node = ndef->getId("mapgen_singlenode");
 	if (c_node == CONTENT_IGNORE)
 		c_node = CONTENT_AIR;
diff --git a/src/mapgen/mapgen_v6.cpp b/src/mapgen/mapgen_v6.cpp
index a418acace..4db8b25ef 100644
--- a/src/mapgen/mapgen_v6.cpp
+++ b/src/mapgen/mapgen_v6.cpp
@@ -57,7 +57,6 @@ FlagDesc flagdesc_mapgen_v6[] = {
 MapgenV6::MapgenV6(MapgenV6Params *params, EmergeParams *emerge)
 	: Mapgen(MAPGEN_V6, params, emerge)
 {
-	m_emerge = emerge;
 	ystride = csize.X;
 
 	heightmap = new s16[csize.X * csize.Z];
@@ -160,8 +159,6 @@ MapgenV6::~MapgenV6()
 	delete noise_humidity;
 
 	delete[] heightmap;
-
-	delete m_emerge; // our responsibility
 }