diff --git a/winsup/cygwin/x86_64/memcpy.s b/winsup/cygwin/x86_64/memcpy.S
similarity index 100%
rename from winsup/cygwin/x86_64/memcpy.s
rename to winsup/cygwin/x86_64/memcpy.S
diff --git a/winsup/cygwin/x86_64/memset.s b/winsup/cygwin/x86_64/memset.S
similarity index 100%
rename from winsup/cygwin/x86_64/memset.s
rename to winsup/cygwin/x86_64/memset.S