diff --git a/src/Makefile.am b/src/Makefile.am
index 5f8a9bba3..43c600c20 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -524,7 +524,9 @@ echo_cancel_test_SOURCES = $(module_echo_cancel_la_SOURCES)
 nodist_echo_cancel_test_SOURCES = $(nodist_module_echo_cancel_la_SOURCES)
 echo_cancel_test_LDADD = $(module_echo_cancel_la_LIBADD)
 echo_cancel_test_CFLAGS = $(module_echo_cancel_la_CFLAGS) -DECHO_CANCEL_TEST=1
+if HAVE_WEBRTC
 echo_cancel_test_CXXFLAGS = $(module_echo_cancel_la_CXXFLAGS) -DECHO_CANCEL_TEST=1
+endif
 echo_cancel_test_LDFLAGS = $(AM_LDFLAGS) $(BINLDFLAGS)
 
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