diff --git a/src/thingdef/thingdef_properties.cpp b/src/thingdef/thingdef_properties.cpp
index 662c868ee3..e745c8f037 100644
--- a/src/thingdef/thingdef_properties.cpp
+++ b/src/thingdef/thingdef_properties.cpp
@@ -629,7 +629,7 @@ DEFINE_PROPERTY(scale, F, Actor)
 //==========================================================================
 DEFINE_PROPERTY(floatbobphase, F, Actor)
 {
-	PROP_FIXED_PARM(id, 0);
+	PROP_INT_PARM(id, 0);
 	if (id < -1 || id >= 64) I_Error ("FloatBobPhase must be in range [-1,63]");
 	defaults->FloatBobPhase = id;
 }