diff --git a/tests/Transceiver52M/Makefile.am b/tests/Transceiver52M/Makefile.am
index 778d64d2..06db5b0d 100644
--- a/tests/Transceiver52M/Makefile.am
+++ b/tests/Transceiver52M/Makefile.am
@@ -8,10 +8,11 @@ noinst_PROGRAMS = \
 	convolve_test
 
 convolve_test_SOURCES = convolve_test.c
+convolve_test_CFLAGS = $(AM_CFLAGS)
 convolve_test_LDADD = $(COMMON_LA) $(ARCH_LA)
 if HAVE_SSE3
-convolve_test_CFLAGS = $(AM_CFLAGS) $(SIMD_FLAGS)
+convolve_test_CFLAGS += $(SIMD_FLAGS)
 endif
 if HAVE_SSE4_1
-convolve_test_CFLAGS = $(AM_CFLAGS) $(SIMD_FLAGS)
+convolve_test_CFLAGS += $(SIMD_FLAGS)
 endif