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-rw-r--r--converter/ppm/ppmtoarbtxt.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/converter/ppm/ppmtoarbtxt.c b/converter/ppm/ppmtoarbtxt.c
index 4a1ee10f..83a93441 100644
--- a/converter/ppm/ppmtoarbtxt.c
+++ b/converter/ppm/ppmtoarbtxt.c
@@ -471,7 +471,7 @@ validateFormatWithPpf(const char *       const format,
 
     default:
         pm_asprintf(errorP, "Has %lu extra transformation%s ",
-                    n-1, n-1 > 1 ? "s" : "");
+                    (unsigned long)n-1, n-1 > 1 ? "s" : "");
         break;
     }
 }