diff --git a/payloads/libpayload/include/libpayload.h b/payloads/libpayload/include/libpayload.h
index 753449d37d..48a034bf05 100644
--- a/payloads/libpayload/include/libpayload.h
+++ b/payloads/libpayload/include/libpayload.h
@@ -302,7 +302,7 @@ long int labs(long int j);
 long long int llabs(long long int j);
 u8 bin2hex(u8 b);
 u8 hex2bin(u8 h);
-void hexdump(void *memory, int length);
+void hexdump(void *memory, size_t length);
 void fatal(const char *msg) __attribute__ ((noreturn));
 /** @} */
 
diff --git a/payloads/libpayload/libc/hexdump.c b/payloads/libpayload/libc/hexdump.c
index e4aa8b93cf..1a35f05c0f 100644
--- a/payloads/libpayload/libc/hexdump.c
+++ b/payloads/libpayload/libc/hexdump.c
@@ -29,7 +29,7 @@
 
 #include <libpayload.h>
 
-void hexdump(void *memory, int length)
+void hexdump(void *memory, size_t length)
 {
 	int i;
 	uint8_t *m;