diff --git a/src/mainboard/amd/bilby/mainboard.c b/src/mainboard/amd/bilby/mainboard.c
index 324c72edef..c9310530d2 100644
--- a/src/mainboard/amd/bilby/mainboard.c
+++ b/src/mainboard/amd/bilby/mainboard.c
@@ -9,6 +9,7 @@
 #include <soc/southbridge.h>
 #include <soc/pci_devs.h>
 #include <soc/platform_descriptors.h>
+#include <string.h>
 #include <types.h>
 #include <commonlib/helpers.h>
 #include <soc/amd/picasso/chip.h>
diff --git a/src/mainboard/amd/mandolin/mainboard.c b/src/mainboard/amd/mandolin/mainboard.c
index 6ae3266154..43fa4152ff 100644
--- a/src/mainboard/amd/mandolin/mainboard.c
+++ b/src/mainboard/amd/mandolin/mainboard.c
@@ -7,6 +7,7 @@
 #include <soc/cpu.h>
 #include <soc/southbridge.h>
 #include <soc/pci_devs.h>
+#include <string.h>
 #include <types.h>
 #include <commonlib/helpers.h>
 #include <soc/amd/picasso/chip.h>