diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index ece5581..65eed24 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -6,10 +6,16 @@ on:
 jobs:
   build:
 
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
+        os: [ubuntu-latest]
+        include:
+         - os: ubuntu-22.04
+           python-version: '3.7'
+         - os: macos-latest
+           python-version: '3.12'
 
     steps:
       - uses: actions/checkout@v2
@@ -27,8 +33,12 @@ jobs:
           pip install numpy pyzmq  # pymatbridge needs numpy and pyzmq preinstalled (i.e. does not work to list in setup.py)
           # Install of current version of pymatbridge on pypi does not work, using the git-repository instead
           pip install git+https://github.com/arokem/python-matlab-bridge.git@master
-          
-
+        if: matrix.os != 'macos-latest'
+      - name: Install macos dependencies
+        run: |
+          brew install libsndfile
+          pip install git+https://github.com/arokem/python-matlab-bridge.git@master
+        if: matrix.os == 'macos-latest'
       - name: Install nara_wpe
         run: |
           pip install -e .[test]
diff --git a/nara_wpe/utils.py b/nara_wpe/utils.py
index 01e164d..ba1777f 100644
--- a/nara_wpe/utils.py
+++ b/nara_wpe/utils.py
@@ -450,7 +450,7 @@ def istft_single_channel(stft_signal, size=1024, shift=256,
     if disable_sythesis_window:
         window = np.ones_like(window)
 
-    time_signal = scipy.zeros(stft_signal.shape[0] * shift + size - shift)
+    time_signal = np.zeros(stft_signal.shape[0] * shift + size - shift)
 
     for j, i in enumerate(range(0, len(time_signal) - size + shift, shift)):
         time_signal[i:i + size] += window * np.real(irfft(stft_signal[j]))