diff --git a/cpu/cc2538/include/periph_cpu.h b/cpu/cc2538/include/periph_cpu.h
index 3a284e36b3..6a108feab0 100644
--- a/cpu/cc2538/include/periph_cpu.h
+++ b/cpu/cc2538/include/periph_cpu.h
@@ -19,6 +19,8 @@
 #ifndef PERIPH_CPU_H_
 #define PERIPH_CPU_H_
 
+#include <stdint.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif