diff --git a/ggml-phi-knc.c b/ggml-phi-knc.c
index 648f81bcf..c15456781 100644
--- a/ggml-phi-knc.c
+++ b/ggml-phi-knc.c
@@ -4,6 +4,9 @@
 
 #include <stdio.h>
 
+// For memcpy.
+#include <string.h>
+
 // No, we have an SIMD unit.
 // #define GGML_SIMD