Index: uspace/Makefile.common
===================================================================
--- uspace/Makefile.common	(revision ef84413529b8e88f0e34e6823b1f70331a1d72f4)
+++ uspace/Makefile.common	(revision dc68f72eac461823c3a678b8d303bd6fcc714e60)
@@ -222,5 +222,5 @@
 # Flags that are always used for HelenOS code, but not for third-party.
 HELENOS_CFLAGS = \
-	-std=gnu99 \
+	-std=gnu11 \
 	$(INCLUDES_FLAGS) \
 	-imacros $(CONFIG_HEADER) \