diff --git a/src/Makefile.am b/src/Makefile.am
index 437311de6..b84c778cc 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1734,9 +1734,9 @@ module_tunnel_sink_la_LDFLAGS = $(MODULE_LDFLAGS)
 module_tunnel_sink_la_LIBADD = $(MODULE_LIBADD) $(X11_LIBS)
 
 module_tunnel_source_la_SOURCES = modules/module-tunnel.c
-module_tunnel_source_la_LDFLAGS = $(MODULE_LDFLAGS) $(X11_CFLAGS)
+module_tunnel_source_la_LDFLAGS = $(MODULE_LDFLAGS)
 module_tunnel_source_la_LIBADD = $(MODULE_LIBADD) $(X11_LIBS)
-module_tunnel_source_la_CFLAGS = $(AM_CFLAGS) -DPA_MODULE_NAME=module_tunnel_source
+module_tunnel_source_la_CFLAGS = $(AM_CFLAGS) $(X11_CFLAGS) -DPA_MODULE_NAME=module_tunnel_source
 
 module_loopback_la_SOURCES = modules/module-loopback.c
 module_loopback_la_LDFLAGS = $(MODULE_LDFLAGS)