diff --git a/pfstools-1.6.5/src/fileformat/ppmio.cpp b/src/fileformat/ppmio.cpp
index bf36334..b348c5c 100644
--- a/pfstools-1.6.5/src/fileformat/ppmio.cpp
+++ b/pfstools-1.6.5/src/fileformat/ppmio.cpp
@@ -28,7 +28,7 @@
 #include "ppmio.h"
 
 extern "C" {
- #include <ppm.h>
+ #include <netpbm/ppm.h>
 }
 
 #include <assert.h>