diff --git a/src/libsodium/Makefile.am b/src/libsodium/Makefile.am
index 7c92462b..1539d184 100644
--- a/src/libsodium/Makefile.am
+++ b/src/libsodium/Makefile.am
@@ -208,7 +208,7 @@ noinst_LTLIBRARIES =  libaesni.la libsse2.la libssse3.la libsse41.la libavx2.la
 
 libaesni_la_LDFLAGS = $(libsodium_la_LDFLAGS)
 libaesni_la_CPPFLAGS = $(libsodium_la_CPPFLAGS) \
-	@CFLAGS_SSSE3@ @CFLAGS_AESNI@ @CFLAGS_PCLMUL@
+	@CFLAGS_SSE2@ @CFLAGS_SSSE3@ @CFLAGS_AESNI@ @CFLAGS_PCLMUL@
 libaesni_la_SOURCES = \
 	crypto_aead/aes256gcm/aesni/aead_aes256gcm_aesni.c