diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index 69361b7ef..05bc6b8bc 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -65,7 +65,7 @@ jobs:
       if: matrix.os == env.GH_COV_OS && github.actor != env.GH_DEPENDABOT
       run: |
         cd ${{ env.OTIO_BUILD_DIR }}
-        lcov --capture -b . --directory . --output-file=coverage.info -q --ignore-errors mismatch
+        lcov --capture -b . --directory . --output-file=coverage.info -q --ignore-errors gcov
         cat coverage.info | sed "s/SF:.*src/SF:src/g" > coverage.filtered.info
         lcov --remove coverage.filtered.info '*/usr/*' --output-file=coverage.filtered.info -q
         lcov --remove coverage.filtered.info '*/deps/*' --output-file=coverage.filtered.info -q
diff --git a/Makefile b/Makefile
index 6bbe0f0d0..9ae9d64d2 100644
--- a/Makefile
+++ b/Makefile
@@ -94,7 +94,7 @@ ifndef OTIO_CXX_BUILD_TMP_DIR
 endif
 	lcov --rc lcov_branch_coverage=1 --capture -b . --directory ${OTIO_CXX_BUILD_TMP_DIR} \
 		--output-file=${OTIO_CXX_BUILD_TMP_DIR}/coverage.info -q \
-		--ignore-errors mismatch
+		--ignore-errors gcov
 	cat ${OTIO_CXX_BUILD_TMP_DIR}/coverage.info | sed "s/SF:.*src/SF:src/g"\
 		> ${OTIO_CXX_BUILD_TMP_DIR}/coverage.filtered.info
 	lcov --rc lcov_branch_coverage=1 --remove ${OTIO_CXX_BUILD_TMP_DIR}/coverage.filtered.info '/usr/*' \