diff --git a/panda/src/osxdisplay/Sources.pp b/panda/src/osxdisplay/Sources.pp
index bcb63d039e..4f1abf90f5 100644
--- a/panda/src/osxdisplay/Sources.pp
+++ b/panda/src/osxdisplay/Sources.pp
@@ -1,4 +1,4 @@
-#define BUILD_DIRECTORY $[IS_OSX]]
+#define BUILD_DIRECTORY $[IS_OSX]
 
 #define OTHER_LIBS interrogatedb:c dconfig:c dtoolconfig:m \
                    dtoolutil:c dtoolbase:c dtool:m prc:c