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-rw-r--r--lib/pam.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/pam.h b/lib/pam.h
index 94c85b4e..99498ed1 100644
--- a/lib/pam.h
+++ b/lib/pam.h
@@ -210,7 +210,7 @@ typedef sample *tuple;
        of the image (see pam.depth above).
     */
 
-#define PAM_OVERALL_MAXVAL 65535
+#define PAM_OVERALL_MAXVAL 65535lu
 
 /* Note: xv uses the same "P7" signature for its thumbnail images (it
    started using it years before PAM and unbeknownst to the designer