diff --git a/configure.ac b/configure.ac
index 17a756020..8cdfa4ccf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -191,15 +191,14 @@ LIBS_SAVE=$LIBS
 LIBGNURL_CHECK_CONFIG(,7.34.0,gnurl=1,gnurl=0)
 LIBCURL_CHECK_CONFIG(,7.34.0,[curl=1],[curl=0])
 
-if test "x$curl" = x1
-then
+AS_IF([test "x$curl" = x1],[
  AC_CHECK_HEADER([curl/curl.h],
   AC_CHECK_DECLS(CURLINFO_TLS_SESSION,[curl=1],[curl=0],[[#include <curl/curl.h>]]),
   [curl=0])
  # need libcurl-gnutls.so, everything else is not acceptable
  AC_CHECK_LIB([curl-gnutls],[curl_easy_getinfo],,[curl=0])
  # cURL must support CURLINFO_TLS_SESSION, version >= 7.34
-fi
+])
 
 # libcurl and libgnurl should be mutually exclusive
 AS_IF([test "$gnurl" = 1],