diff --git a/cpu/lm4f120/include/hwtimer_cpu.h b/cpu/lm4f120/include/hwtimer_cpu.h
index a16de70dad..ee523f94f8 100644
--- a/cpu/lm4f120/include/hwtimer_cpu.h
+++ b/cpu/lm4f120/include/hwtimer_cpu.h
@@ -20,7 +20,7 @@
 #define HWTIMER_CPU_H
 
 #ifdef __cplusplus
-extern "C"{
+extern "C" {
 #endif
 
 /**