diff --git a/src/thingdef/thingdef_codeptr.cpp b/src/thingdef/thingdef_codeptr.cpp
index a3e4ac6fa..70a6d96ec 100644
--- a/src/thingdef/thingdef_codeptr.cpp
+++ b/src/thingdef/thingdef_codeptr.cpp
@@ -5553,7 +5553,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_DropItem)
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_SetSpeed)
 {
 	PARAM_ACTION_PROLOGUE;
-	PARAM_INT(speed);
+	PARAM_FIXED(speed);
 	PARAM_INT_OPT(ptr)	{ ptr = AAPTR_DEFAULT; }
 
 	AActor *ref = COPY_AAPTR(self, ptr);
@@ -5573,7 +5573,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_SetSpeed)
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_SetFloatSpeed)
 {
 	PARAM_ACTION_PROLOGUE;
-	PARAM_INT(speed);
+	PARAM_FIXED(speed);
 	PARAM_INT_OPT(ptr)	{ ptr = AAPTR_DEFAULT; }
 
 	AActor *ref = COPY_AAPTR(self, ptr);