diff --git a/src/include.am b/src/include.am
index 4a57f52d0..67fc6b610 100644
--- a/src/include.am
+++ b/src/include.am
@@ -204,7 +204,7 @@ src_libwolfssl_la_SOURCES += wolfcrypt/src/dsa.c
 endif
 
 if BUILD_AESNI
-src_libwolfssl_la_SOURCES += wolfcrypt/src/aes_asm.s
+src_libwolfssl_la_SOURCES += wolfcrypt/src/aes_asm.S
 endif
 
 if BUILD_CAMELLIA
diff --git a/wolfcrypt/src/aes_asm.s b/wolfcrypt/src/aes_asm.S
similarity index 99%
rename from wolfcrypt/src/aes_asm.s
rename to wolfcrypt/src/aes_asm.S
index 1791837b7..cff57db9d 100644
--- a/wolfcrypt/src/aes_asm.s
+++ b/wolfcrypt/src/aes_asm.S
@@ -1,4 +1,4 @@
-/* aes_asm.s
+/* aes_asm.S
  *
  * Copyright (C) 2006-2017 wolfSSL Inc.
  *