diff --git a/cpu/efm32/include/drivers/coretemp.h b/cpu/efm32/include/drivers/coretemp.h
index 71dbd65f1c..3b28461ea9 100644
--- a/cpu/efm32/include/drivers/coretemp.h
+++ b/cpu/efm32/include/drivers/coretemp.h
@@ -33,6 +33,7 @@
 #ifndef DRIVERS_CORETEMP_H
 #define DRIVERS_CORETEMP_H
 
+#include <stdint.h>
 
 #ifdef __cplusplus
 extern "C" {