diff --git a/ci/x86_64-linux-debug-llvm.sh b/ci/x86_64-linux-debug-llvm.sh
index 6ef1b5a009..26d3911c13 100755
--- a/ci/x86_64-linux-debug-llvm.sh
+++ b/ci/x86_64-linux-debug-llvm.sh
@@ -54,6 +54,7 @@ stage3-debug/bin/zig build \
 stage3-debug/bin/zig build test docs \
   --maxrss ${ZSF_MAX_RSS:-0} \
   -Dlldb=$HOME/deps/lldb-zig/Debug-e0a42bb34/bin/lldb \
+  -Dlibc-test-path=$HOME/deps/libc-test-f2bac77 \
   -fqemu \
   -fwasmtime \
   -Dstatic-llvm \
diff --git a/ci/x86_64-linux-release.sh b/ci/x86_64-linux-release.sh
index 99781406e2..94e6e93bbd 100755
--- a/ci/x86_64-linux-release.sh
+++ b/ci/x86_64-linux-release.sh
@@ -59,6 +59,7 @@ stage3-release/bin/zig build \
 stage3-release/bin/zig build test docs \
   --maxrss ${ZSF_MAX_RSS:-0} \
   -Dlldb=$HOME/deps/lldb-zig/Release-e0a42bb34/bin/lldb \
+  -Dlibc-test-path=$HOME/deps/libc-test-f2bac77 \
   -fqemu \
   -fwasmtime \
   -Dstatic-llvm \