diff --git a/src/libsodium/Makefile.am b/src/libsodium/Makefile.am
index be6f889c..124091d6 100644
--- a/src/libsodium/Makefile.am
+++ b/src/libsodium/Makefile.am
@@ -197,7 +197,7 @@ endif
 if HAVE_AMD64_ASM
 libsodium_la_SOURCES += \
 	crypto_stream/salsa20/amd64_xmm6/api.h \
-	crypto_stream/salsa20/amd64_xmm6/stream_salsa20_amd64_xmm6.s
+	crypto_stream/salsa20/amd64_xmm6/stream_salsa20_amd64_xmm6.S
 else
 libsodium_la_SOURCES += \
 	crypto_stream/salsa20/ref/api.h \
diff --git a/src/libsodium/crypto_stream/salsa20/amd64_xmm6/stream_salsa20_amd64_xmm6.s b/src/libsodium/crypto_stream/salsa20/amd64_xmm6/stream_salsa20_amd64_xmm6.S
similarity index 100%
rename from src/libsodium/crypto_stream/salsa20/amd64_xmm6/stream_salsa20_amd64_xmm6.s
rename to src/libsodium/crypto_stream/salsa20/amd64_xmm6/stream_salsa20_amd64_xmm6.S