diff --git a/src/mapgen_v6.cpp b/src/mapgen_v6.cpp
index 4783e4285..58e6022f8 100644
--- a/src/mapgen_v6.cpp
+++ b/src/mapgen_v6.cpp
@@ -117,6 +117,8 @@ MapgenV6::~MapgenV6()
 	delete noise_mud;
 	delete noise_beach;
 	delete noise_biome;
+
+	delete[] heightmap;
 }