diff --git a/.gitignore b/.gitignore
index 787a967..8ab3862 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,7 @@
 *~
 *.o
+*.i
+*.s
 .libs/
 *.lo
 *.pc
diff --git a/Makefile.am b/Makefile.am
index 71b0c71..92ef321 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -97,6 +97,10 @@ libbsdiff_la_LDFLAGS = \
 	-version-info $(LIBBSDIFF_CURRENT):$(LIBBSDIFF_REVISION):$(LIBBSDIFF_AGE) \
 	-Wl,--version-script=$(top_srcdir)/src/bsdiff.sym
 
+mostlyclean-local:
+	-rm -f *.i
+	-rm -f *.s
+
 distclean-local:
 	-rm -f config.guess~
 	-rm -f config.h.in~