diff --git a/src/p_acs.cpp b/src/p_acs.cpp
index f47b5b773..5c4749dec 100644
--- a/src/p_acs.cpp
+++ b/src/p_acs.cpp
@@ -5062,7 +5062,7 @@ static void SetActorAngle(AActor *activator, int tid, int angle, bool interpolat
 
 static void SetActorPitch(AActor *activator, int tid, int angle, bool interpolate)
 {
-	DAngle an = ACSToAngle(angle);
+	DAngle an = ACSToAngle(angle).Normalized180();
 	if (tid == 0)
 	{
 		if (activator != NULL)