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-rw-r--r--editor/ppmlabel.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/editor/ppmlabel.c b/editor/ppmlabel.c
index 885d7d36..389ab59e 100644
--- a/editor/ppmlabel.c
+++ b/editor/ppmlabel.c
@@ -7,7 +7,7 @@
                   June 1995
 */
 
-#define _XOPEN_SOURCE   /* get M_PI in math.h */
+#define _XOPEN_SOURCE 500  /* get M_PI in math.h */
 
 #include <math.h>
 #include <string.h>