diff --git a/docs/libcurl/libcurl.m4 b/docs/libcurl/libcurl.m4
index 2cf3edd1b..f6ebdd239 100644
--- a/docs/libcurl/libcurl.m4
+++ b/docs/libcurl/libcurl.m4
@@ -178,7 +178,7 @@ x=CURLOPT_WRITEDATA;
 x=CURLOPT_ERRORBUFFER;
 x=CURLOPT_STDERR;
 x=CURLOPT_VERBOSE;
-if (x) ;
+if (x) {;}
 ]])],libcurl_cv_lib_curl_usable=yes,libcurl_cv_lib_curl_usable=no)
 
            CPPFLAGS=$_libcurl_save_cppflags