diff --git a/src/mapgen.cpp b/src/mapgen.cpp
index 3d5c7b3cc..4433a2a58 100644
--- a/src/mapgen.cpp
+++ b/src/mapgen.cpp
@@ -47,6 +47,7 @@ FlagDesc flagdesc_mapgen[] = {
 	{"v6_biome_blend", MGV6_BIOME_BLEND},
 	{"flat",           MG_FLAT},
 	{"nolight",        MG_NOLIGHT},
+	{"v6_nomudflow",   MGV6_NOMUDFLOW},
 	{NULL,             0}
 };
 
diff --git a/src/mapgen.h b/src/mapgen.h
index feec60e19..aa66982c3 100644
--- a/src/mapgen.h
+++ b/src/mapgen.h
@@ -38,6 +38,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #define MG_NOLIGHT       0x40
 #define MGV7_MOUNTAINS   0x80
 #define MGV7_RIDGES      0x100
+#define MGV6_NOMUDFLOW   0x200
 
 /////////////////// Ore generation flags
 // Use absolute value of height to determine ore placement
diff --git a/src/mapgen_v6.cpp b/src/mapgen_v6.cpp
index 3e152861c..a27ca2e0a 100644
--- a/src/mapgen_v6.cpp
+++ b/src/mapgen_v6.cpp
@@ -439,7 +439,8 @@ void MapgenV6::makeChunk(BlockMakeData *data) {
 		addDirtGravelBlobs();
 
 		// Flow mud away from steep edges
-		flowMud(mudflow_minpos, mudflow_maxpos);
+		if (!(flags & MGV6_NOMUDFLOW))
+			flowMud(mudflow_minpos, mudflow_maxpos);
 
 	}