diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 7029414a9..27f9cd53a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -322,7 +322,7 @@ jobs:
           sudo systemctl stop ndpisrvd.service
           journalctl --no-tail --no-pager -u ndpisrvd.service -u ndpid@lo.service
       - name: Build PF_RING and nDPId (invoke CC directly - dynamic nDPI lib)
-        if: startsWith(matrix.ndpi_build, '-DBUILD_NDPI=ON') && startsWith(matrix.coverage, '-DENABLE_COVERAGE=OFF') && startsWith(matrix.sanitizer, '-DENABLE_SANITIZER=ON') && startsWith(matrix.ndpid_gcrypt, '-DNDPI_WITH_GCRYPT=OFF') && startsWith(matrix.ndpid_zlib, '-DENABLE_ZLIB=ON')
+        if: startsWith(matrix.ndpi_build, '-DBUILD_NDPI=ON') && startsWith(matrix.coverage, '-DENABLE_COVERAGE=OFF') && startsWith(matrix.sanitizer, '-DENABLE_SANITIZER=ON') && startsWith(matrix.ndpid_gcrypt, '-DNDPI_WITH_GCRYPT=OFF') && startsWith(matrix.ndpid_zlib, '-DENABLE_ZLIB=ON') && endsWith(matrix.compiler, 'gcc-9') == false
         run: |
           git clone --depth=1 https://github.com/ntop/PF_RING.git
           cd PF_RING/userland && ./configure && make && sudo make install prefix=/usr