diff --git a/lib/curl_addrinfo.c b/lib/curl_addrinfo.c
index 9d56e6a2f..a9db3d75f 100644
--- a/lib/curl_addrinfo.c
+++ b/lib/curl_addrinfo.c
@@ -69,7 +69,7 @@
  */
 
 #if defined(__INTEL_COMPILER) && (__INTEL_COMPILER == 910) && \
-    defined(__unix__) &&  defined(__i386__)
+    defined(__OPTIMIZE__) && defined(__unix__) &&  defined(__i386__)
   /* workaround icc 9.1 optimizer issue */
 # define vqualifier volatile
 #else