diff --git a/src/extmem/memccpy_s.c b/src/extmem/memccpy_s.c
index b60a0f9d..ed50dd96 100644
--- a/src/extmem/memccpy_s.c
+++ b/src/extmem/memccpy_s.c
@@ -89,12 +89,12 @@ EXPORT errno_t _memccpy_s_chk(void *restrict dest, rsize_t dmax,
                               const size_t destbos, const size_t srcbos)
 #endif
 {
-    (void) srcbos;
-
     uint8_t *dp;
     const uint8_t *sp;
     rsize_t orig_dmax = dmax;
 
+    (void) srcbos;
+
     dp = (uint8_t *)dest;
     sp = (uint8_t *)src;