diff --git a/.gitignore b/.gitignore
index a0212798..17874aa0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -31,6 +31,7 @@
 
 # Ignore common compiled artifacts.
 *~
+*.dwo
 *.o
 lib*.a
 /breakpad.pc
diff --git a/Makefile.am b/Makefile.am
index ccb43a59..e0a8b6ae 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1304,3 +1304,6 @@ EXTRA_DIST = \
 	src/tools/windows/dump_syms/testdata/dump_syms_regtest.sym \
 	src/tools/windows/symupload/symupload.cc \
 	src/tools/windows/symupload/symupload.vcproj
+
+mostlyclean-local:
+	-find src -name '*.dwo' -exec rm -f {} +
diff --git a/Makefile.in b/Makefile.in
index e2d7734b..be1e5189 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -7728,7 +7728,8 @@ maintainer-clean-am: distclean-am maintainer-clean-generic
 
 mostlyclean: mostlyclean-am
 
-mostlyclean-am: mostlyclean-compile mostlyclean-generic
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-local
 
 pdf: pdf-am
 
@@ -7769,8 +7770,8 @@ uninstall-am: uninstall-binPROGRAMS uninstall-dist_docDATA \
 	install-pdf-am install-pkgconfigDATA install-ps install-ps-am \
 	install-strip installcheck installcheck-am installdirs \
 	maintainer-clean maintainer-clean-generic mostlyclean \
-	mostlyclean-compile mostlyclean-generic pdf pdf-am ps ps-am \
-	recheck tags tags-am uninstall uninstall-am \
+	mostlyclean-compile mostlyclean-generic mostlyclean-local pdf \
+	pdf-am ps ps-am recheck tags tags-am uninstall uninstall-am \
 	uninstall-binPROGRAMS uninstall-dist_docDATA \
 	uninstall-includecHEADERS uninstall-includeclHEADERS \
 	uninstall-includeclcHEADERS uninstall-includecldwcHEADERS \
@@ -7782,6 +7783,9 @@ uninstall-am: uninstall-binPROGRAMS uninstall-dist_docDATA \
 .PRECIOUS: Makefile
 
 
+mostlyclean-local:
+	-find src -name '*.dwo' -exec rm -f {} +
+
 # Tell versions [3.59,3.63) of GNU make to not export all variables.
 # Otherwise a system limit (for SysV at least) may be exceeded.
 .NOEXPORT: