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path: root/converter/ppm/ppmtompeg/mfwddct.c
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-rw-r--r--converter/ppm/ppmtompeg/mfwddct.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/converter/ppm/ppmtompeg/mfwddct.c b/converter/ppm/ppmtompeg/mfwddct.c
index ce85436d..9381e51c 100644
--- a/converter/ppm/ppmtompeg/mfwddct.c
+++ b/converter/ppm/ppmtompeg/mfwddct.c
@@ -15,7 +15,7 @@
  * instead of floating point.
  */
 
-#define _XOPEN_SOURCE  /* Make sure M_PI is in math.h */
+#define _XOPEN_SOURCE 500  /* get M_PI in math.h */
 
 #include <math.h>