diff --git a/src/p_map.cpp b/src/p_map.cpp
index 5dd0967b9..f409dafa4 100644
--- a/src/p_map.cpp
+++ b/src/p_map.cpp
@@ -630,7 +630,7 @@ int P_GetFriction(const AActor *mo, int *frictionfactor)
 				}
 			}
 
-			if (!(sec->special & FRICTION_MASK) &&
+			if (!(sec->Flags & SECF_FRICTION) &&
 				Terrains[TerrainTypes[sec->GetTexture(sector_t::floor)]].Friction == 0)
 			{
 				continue;
diff --git a/src/p_saveg.cpp b/src/p_saveg.cpp
index fa1f395cf..16109891b 100644
--- a/src/p_saveg.cpp
+++ b/src/p_saveg.cpp
@@ -413,8 +413,12 @@ void P_SerializeWorld (FArchive &arc)
 			if (sec->special & SECRET_MASK)
 			{
 				sec->Flags |= SECF_SECRET;
-				sec->special &= ~SECRET_MASK;
 			}
+			if (sec->special & FRICTION_MASK)
+			{
+				sec->Flags |= SECF_FRICTION;
+			}
+			sec->special &= ~(SECRET_MASK|FRICTION_MASK);
 		}
 		arc	<< sec->interpolations[0]
 			<< sec->interpolations[1]
diff --git a/src/p_spec.cpp b/src/p_spec.cpp
index d94d91ac5..a5bdfffd4 100644
--- a/src/p_spec.cpp
+++ b/src/p_spec.cpp
@@ -1191,9 +1191,13 @@ void P_SpawnSpecials (void)
 		if (sector->special & SECRET_MASK)
 		{
 			sector->Flags |= SECF_SECRET | SECF_WASSECRET;
-			sector->special &= ~SECRET_MASK;
 			level.total_secrets++;
 		}
+		if (sector->special & FRICTION_MASK)
+		{
+			sector->Flags |= SECF_FRICTION;
+		}
+		sector->special &= ~(SECRET_MASK|FRICTION_MASK);
 
 		switch (sector->special & 0xff)
 		{
@@ -1262,7 +1266,7 @@ void P_SpawnSpecials (void)
 			sector->friction = FRICTION_LOW;
 			sector->movefactor = 0x269;
 			sector->special &= 0xff00;
-			sector->special |= FRICTION_MASK;
+			sector->Flags |= SECF_FRICTION;
 			break;
 
 		  // [RH] Hexen-like phased lighting
@@ -2060,11 +2064,11 @@ void P_SetSectorFriction (int tag, int amount, bool alterFlag)
 			// can be enabled and disabled at will.
 			if (friction == ORIG_FRICTION)
 			{
-				sectors[s].special &= ~FRICTION_MASK;
+				sectors[s].Flags &= ~SECF_FRICTION;
 			}
 			else
 			{
-				sectors[s].special |= FRICTION_MASK;
+				sectors[s].Flags |= SECF_FRICTION;
 			}
 		}
 	}
diff --git a/src/r_defs.h b/src/r_defs.h
index 0c873beeb..014fa1b32 100644
--- a/src/r_defs.h
+++ b/src/r_defs.h
@@ -355,6 +355,7 @@ enum
 	SECF_NOFALLINGDAMAGE= 2,	// No falling damage in this sector
 	SECF_FLOORDROP		= 4,	// all actors standing on this floor will remain on it when it lowers very fast.
 	SECF_NORESPAWN		= 8,	// players can not respawn in this sector
+	SECF_FRICTION		= 16,	// sector has friction enabled
 
 
 	SECF_WASSECRET		= 1 << 30,	// a secret that was discovered