diff --git a/Meta/Lagom/BuildFuzzers.sh b/Meta/Lagom/BuildFuzzers.sh
index 0f01928da4..965d81b7e0 100755
--- a/Meta/Lagom/BuildFuzzers.sh
+++ b/Meta/Lagom/BuildFuzzers.sh
@@ -47,7 +47,10 @@ unset CXXFLAGS
 export AFL_NOOPT=1
 
 if [ "$#" -gt "0" ] && [ "--oss-fuzz" = "$1" ] ; then
-    CXXFLAGS="$CXXFLAGS -DOSS_FUZZ=ON"
+    # The oss-fuzz runner image (as of June 2024) has libstdc++ 9, which lacks the
+    # <coroutine> header. Use the more modern libc++ shipped with oss-fuzz's Clang.
+    # It's already set in CXXFLAGS_SAVE.
+    CXXFLAGS="$CXXFLAGS -DOSS_FUZZ=ON -stdlib=libc++"
 fi
 
 # FIXME: Replace these CMake invocations with a CMake superbuild?