diff --git a/graphics/twm4nx/Makefile b/graphics/twm4nx/Makefile
index 287963a81..dac0b70aa 100644
--- a/graphics/twm4nx/Makefile
+++ b/graphics/twm4nx/Makefile
@@ -71,7 +71,7 @@ ifeq ($(CONFIG_TWM4NX_NXTERM),y)
 CXXSRCS  += cnxterm.cxx
 endif
 
-CXXSRCS   = ctwm4nx.cxx
+CXXSRCS  += ctwm4nx.cxx
 
 VPATH     = src:apps