diff --git a/.travis.yml b/.travis.yml
index 336b67d299..456b5abc56 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -168,7 +168,7 @@ after_failure:
   - if [[ "$DISTCHECK" != "" ]]; then make show-distdir-testlog || echo "make failed"; fi
 
 before_cache:
-    # Delete all .gcda files.
+  ## Delete all gcov files.
   - if [[ "$COVERAGE_OPTIONS" != "" ]]; then make reset-gcov; fi
 
 notifications:
diff --git a/Makefile.am b/Makefile.am
index e4be3f26f9..4b1687f921 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -149,7 +149,9 @@ test-full: need-stem-path need-chutney-path check test-network test-stem
 test-full-online: need-stem-path need-chutney-path check test-network test-stem-full
 
 reset-gcov:
-	rm -f $(top_builddir)/src/*/*.gcda $(top_builddir)/src/*/*/*.gcda
+	rm -f $(top_builddir)/src/*/*.gcda $(top_builddir)/src/*/*/*.gcda \
+	      $(top_builddir)/src/*/*.gcno $(top_builddir)/src/*/*/*.gcno \
+	      $(top_builddir)/src/*/*.gcov $(top_builddir)/src/*/*/*.gcov
 
 HTML_COVER_DIR=$(top_builddir)/coverage_html
 coverage-html: all