diff --git a/src/include.am b/src/include.am
index 26112e16e..6cef15cd1 100644
--- a/src/include.am
+++ b/src/include.am
@@ -83,7 +83,7 @@ src_libwolfssl_la_SOURCES += wolfcrypt/src/aes.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_DES3