diff --git a/CMakeLists.txt b/CMakeLists.txt
index 803b13a72bc9839990662abd7700fd4bf020d03d..b21b7238c03c472741e381368f1713a6d22babf9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -180,7 +180,7 @@ if("${CMAKE_BUILD_TYPE}" STREQUAL "Coverage")
     ALL
     COMMAND ${CMAKE_COMMAND} -E remove_directory "${PASTIS_BINARY_DIR}/coverage"
     COMMAND ${CMAKE_COMMAND} -E make_directory "${PASTIS_BINARY_DIR}/coverage"
-    COMMAND ${GCOVR} ${GCOVR_OPTIONS} --html --html-details -o "${PASTIS_BINARY_DIR}/coverage/coverage.html"
+    COMMAND ${GCOVR} ${GCOVR_OPTIONS} --delete --html --html-details -o "${PASTIS_BINARY_DIR}/coverage/coverage.html"
     DEPENDS coverage
     COMMENT "Building coverage html report."
     WORKING_DIRECTORY "${PASTIS_BINARY_DIR}"