diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ac5f716..f2b38c1 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -75,7 +75,7 @@ jobs:
           if [ "$RUNNER_OS" == "Windows" ]; then
             export PATH="$GITHUB_WORKSPACE/.nim_runtime/bin:$HOME/.nimble/bin:$PATH"
           fi
-          nim c -r --mm:${{ matrix.mm }} -d:chronicles_log_level=WARN tests/test_alloc.nim
+          nim c -r --mm:${{ matrix.mm }} -d:chronicles_log_level=WARN -d:ffiAllowSignalHandler tests/test_alloc.nim
 
       - name: Run FFI context tests (${{ matrix.mm }})
         shell: bash
@@ -83,7 +83,7 @@ jobs:
           if [ "$RUNNER_OS" == "Windows" ]; then
             export PATH="$GITHUB_WORKSPACE/.nim_runtime/bin:$HOME/.nimble/bin:$PATH"
           fi
-          nim c -r --mm:${{ matrix.mm }} -d:chronicles_log_level=WARN tests/test_ffi_context.nim
+          nim c -r --mm:${{ matrix.mm }} -d:chronicles_log_level=WARN -d:ffiAllowSignalHandler tests/test_ffi_context.nim
 
       - name: Run GC compatibility tests (${{ matrix.mm }})
         shell: bash
@@ -91,4 +91,4 @@ jobs:
           if [ "$RUNNER_OS" == "Windows" ]; then
             export PATH="$GITHUB_WORKSPACE/.nim_runtime/bin:$HOME/.nimble/bin:$PATH"
           fi
-          nim c -r --mm:${{ matrix.mm }} -d:chronicles_log_level=WARN tests/test_gc_compat.nim
+          nim c -r --mm:${{ matrix.mm }} -d:chronicles_log_level=WARN -d:ffiAllowSignalHandler tests/test_gc_compat.nim