diff --git a/cc/cc_test.go b/cc/cc_test.go
index 278efa1..3d39601 100644
--- a/cc/cc_test.go
+++ b/cc/cc_test.go
@@ -3980,7 +3980,7 @@
 	cppOnly := []string{"-fPIC", "${config.CommonGlobalCppflags}", "${config.DeviceGlobalCppflags}", "${config.ArmCppflags}"}
 
 	cflags := []string{"-Wall", "-Werror", "-std=candcpp"}
-	cstd := []string{"-std=gnu99", "-std=conly"}
+	cstd := []string{"-std=gnu11", "-std=conly"}
 	cppstd := []string{"-std=gnu++17", "-std=cpp", "-fno-rtti"}
 
 	lastIncludes := []string{
diff --git a/cc/config/global.go b/cc/config/global.go
index 8dda537..f7c3e35 100644
--- a/cc/config/global.go
+++ b/cc/config/global.go
@@ -280,7 +280,7 @@
 		"-w",
 	}
 
-	CStdVersion               = "gnu99"
+	CStdVersion               = "gnu11"
 	CppStdVersion             = "gnu++17"
 	ExperimentalCStdVersion   = "gnu11"
 	ExperimentalCppStdVersion = "gnu++2a"