diff --git a/ci/setup-prerequisites-unittest.sh b/ci/setup-prerequisites-unittest.sh
index 6387460..d054242 100755
--- a/ci/setup-prerequisites-unittest.sh
+++ b/ci/setup-prerequisites-unittest.sh
@@ -32,5 +32,8 @@ git fetch --depth 1 origin f8d7d77c06936315286eb55f8de22cd23c188571
 git checkout FETCH_HEAD
 mkdir build
 cd build
-cmake .. -GNinja
+cmake .. -GNinja -DCMAKE_INSTALL_PREFIX=/tmp/gtest_install
+sudo ninja install
+rm -rf *
+cmake .. -GNinja -DCMAKE_CXX_COMPILER=clang++-16 -DCMAKE_CXX_FLAGS=-stdlib=libc++ -DCMAKE_INSTALL_PREFIX=/tmp/gtest_install_libcxx
 sudo ninja install
diff --git a/ci/unittest.py b/ci/unittest.py
index cd81e56..0b2f76d 100644
--- a/ci/unittest.py
+++ b/ci/unittest.py
@@ -17,6 +17,10 @@ def get_c_compiler_counterpart(compiler: str) -> str:
 def build(runner: MatrixRunner):
     if platform.system() == "Linux":
         matrix = runner.current_config()
+        if "stdlib" in matrix and matrix["stdlib"] == "libc++":
+            gtest_path = "/tmp/gtest_install_libcxx"
+        else:
+            gtest_path = "/tmp/gtest_install"
         args = [
             "cmake",
             "..",
@@ -35,6 +39,7 @@ def build(runner: MatrixRunner):
             f"-DCPPTRACE_USE_EXTERNAL_LIBDWARF=On",
             f"-DCPPTRACE_USE_EXTERNAL_ZSTD=On",
             f"-DCPPTRACE_USE_EXTERNAL_GTEST=On",
+            f"-DCMAKE_PREFIX_PATH={gtest_path}",
             *(["-DCMAKE_CXX_FLAGS=-stdlib=libc++"] if "stdlib" in matrix and matrix["stdlib"] == "libc++" else [])
         ]
         return runner.run_command(*args) and runner.run_command("ninja")