diff --git a/boringssl/build.sh b/boringssl/build.sh
index d2b0da59e..0fa94eef8 100755
--- a/boringssl/build.sh
+++ b/boringssl/build.sh
@@ -20,6 +20,7 @@ cd /work/boringssl
 
 CFLAGS="$CFLAGS -DBORINGSSL_UNSAFE_FUZZER_MODE"
 CXXFLAGS="$CXXFLAGS -DBORINGSSL_UNSAFE_FUZZER_MODE"
+export LDFLAGS=$FUZZER_LDFLAGS
 
 cmake -GNinja -DCMAKE_C_COMPILER=$CC -DCMAKE_CXX_COMPILER=$CXX \
     -DCMAKE_C_FLAGS="$CFLAGS" -DCMAKE_CXX_FLAGS="$CXXFLAGS" \
diff --git a/harfbuzz/build.sh b/harfbuzz/build.sh
index 4fd0e1429..07726039a 100755
--- a/harfbuzz/build.sh
+++ b/harfbuzz/build.sh
@@ -19,6 +19,7 @@ cd /src/harfbuzz
 
 # Build the library.
 ./autogen.sh
+export LDFLAGS=$FUZZER_LDFLAGS
 ./configure
 make clean all