diff --git a/Makefile.am b/Makefile.am
index 995f2de..9feaf96 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -62,7 +62,8 @@
 	libkmod/libkmod-index.h \
 	libkmod/libkmod-module.c \
 	libkmod/libkmod-file.c \
-	libkmod/libkmod-elf.c
+	libkmod/libkmod-elf.c \
+	libkmod/libkmod-signature.c
 
 EXTRA_DIST += libkmod/libkmod.sym
 EXTRA_DIST += libkmod/README libkmod/COPYING testsuite/COPYING COPYING