diff --git a/panda/src/mathutil/fftCompressor.cxx b/panda/src/mathutil/fftCompressor.cxx
index f04f7eb92c..66ddfef36d 100644
--- a/panda/src/mathutil/fftCompressor.cxx
+++ b/panda/src/mathutil/fftCompressor.cxx
@@ -31,7 +31,7 @@
 #undef howmany
 #endif
 
-#ifdef IS_OSX
+#ifdef HAVE_DRFFTW_H
   #include "drfftw.h"
 #else
   #include "rfftw.h"