diff --git a/src/object/C4Object.cpp b/src/object/C4Object.cpp
index b9000575d..f6da7d205 100644
--- a/src/object/C4Object.cpp
+++ b/src/object/C4Object.cpp
@@ -3079,7 +3079,7 @@ void C4Object::ContactAction()
 			break;
 		case DFA_SWIM:
 			// Try corner scale out
-			if (!GBackLiquid(GetX(),GetY()-1+Def->Float*Con/FullCon-1))
+			if (!GBackSemiSolid(GetX(),GetY()-1+Def->Float*Con/FullCon-1))
 				if (ObjectActionCornerScale(this)) return;
 			break;
 		}
@@ -3149,7 +3149,7 @@ void C4Object::ContactAction()
 			return;
 		case DFA_SWIM:
 			// Only scale if swimming at the surface
-			if (!GBackLiquid(GetX(),GetY()-1+Def->Float*Con/FullCon-1))
+			if (!GBackSemiSolid(GetX(),GetY()-1+Def->Float*Con/FullCon-1))
 			{
 				// Try scale, only if swimming at the surface.
 				if (ComDirLike(Action.ComDir, COMD_Left))
@@ -3203,7 +3203,7 @@ void C4Object::ContactAction()
 			return;
 		case DFA_SWIM:
 			// Only scale if swimming at the surface
-			if (!GBackLiquid(GetX(),GetY()-1+Def->Float*Con/FullCon-1))
+			if (!GBackSemiSolid(GetX(),GetY()-1+Def->Float*Con/FullCon-1))
 			{
 				// Try scale
 				if (ComDirLike(Action.ComDir, COMD_Right))