diff --git a/projects/tinyxml2/build.sh b/projects/tinyxml2/build.sh
index 0c43f40ce..a3b4272a6 100644
--- a/projects/tinyxml2/build.sh
+++ b/projects/tinyxml2/build.sh
@@ -14,6 +14,10 @@
 # limitations under the License.
 #
 ################################################################################
+
+# Make sure OSS-Fuzz's CXXFLAGS are propagated into the build
+sed -i 's/CXXFLAGS =/#CXXFLAGS/g' Makefile
+
 make -j$(nproc) clean
 make -j$(nproc) all