diff --git a/panda/src/mathutil/fftCompressor.cxx b/panda/src/mathutil/fftCompressor.cxx
index 5cce5ae484..fe5fe89b35 100644
--- a/panda/src/mathutil/fftCompressor.cxx
+++ b/panda/src/mathutil/fftCompressor.cxx
@@ -19,6 +19,7 @@
 #include "datagram.h"
 #include "datagramIterator.h"
 #include "compose_matrix.h"
+#include "pmap.h"
 #include <math.h>
 
 #ifdef HAVE_FFTW