diff --git a/docs/libcurl/opts/CURLOPT_DEBUGFUNCTION.3 b/docs/libcurl/opts/CURLOPT_DEBUGFUNCTION.3
index 9079ff2d0..bf07499a0 100644
--- a/docs/libcurl/opts/CURLOPT_DEBUGFUNCTION.3
+++ b/docs/libcurl/opts/CURLOPT_DEBUGFUNCTION.3
@@ -103,8 +103,10 @@ void dump(const char *text,
     }
 
     /* show data on the right */
-    for(c = 0; (c < width) && (i+c < size); c++)
-      fputc(ptr[i+c]>=0x20) && (ptr[i+c]<0x80)?ptr[i+c]:'.', stream);
+    for(c = 0; (c < width) && (i+c < size); c++) {
+      char x = (ptr[i+c] >= 0x20 && ptr[i+c] < 0x80) ? ptr[i+c] : '.';
+      fputc(x, stream);
+    }
 
     fputc('\\n', stream); /* newline */
   }