diff --git a/arch/arm/src/stm32f7/stm32_allocateheap.c b/arch/arm/src/stm32f7/stm32_allocateheap.c
index 541e0654b1f..8b21ad68b76 100644
--- a/arch/arm/src/stm32f7/stm32_allocateheap.c
+++ b/arch/arm/src/stm32f7/stm32_allocateheap.c
@@ -41,6 +41,7 @@
 
 #include <sys/types.h>
 #include <stdint.h>
+#include <string.h>
 #include <assert.h>
 #include <debug.h>