diff --git a/Makefile.am b/Makefile.am
index fb28cad..c92b2fc 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -33,7 +33,7 @@
 	comm_module.hpp \
 	comm_module.cpp \
 	main.hpp \
-	main.cpp \
+	main.cpp
 
 netipmid_LDFLAGS = $(SYSTEMD_LIBS) $(CRYPTO_LIBS) $(libmapper_LIBS)
 netipmid_CXXFLAGS = $(SYSTEMD_CFLAGS) $(libmapper_CFLAGS)