diff --git a/src/microhttpd/test_postprocessor_amp.c b/src/microhttpd/test_postprocessor_amp.c
index 610a3da3..0569cb1f 100644
--- a/src/microhttpd/test_postprocessor_amp.c
+++ b/src/microhttpd/test_postprocessor_amp.c
@@ -8,9 +8,9 @@
 uint64_t num_errors;
 
 enum MHD_Result
-check_post (void *cls, enum MHD_ValueKind kind, const char*key,
-            const char*filename, const char*content_type,
-            const char*content_encoding, const char*data,
+check_post (void *cls, enum MHD_ValueKind kind, const char *key,
+            const char *filename, const char *content_type,
+            const char *content_encoding, const char *data,
             uint64_t off, size_t size)
 {
   (void) cls; (void) kind; (void) filename; (void) content_type;  /* Unused. Silent compiler warning. */