diff --git a/.travis.yml b/.travis.yml
index 59c6dae..2216bb7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,7 +14,7 @@ jobs:
     osx_image: xcode11.4
 
 before_script:
-  - autoreconf -i -f
+  - autoreconf -i -f -Wno-portability
 
 script:
   - ./configure --disable-man --disable-silent-rules
diff --git a/appveyor.yml b/appveyor.yml
index 8344a33..9bc1d0e 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -23,14 +23,14 @@ build_script:
       {
         $env:MSYSTEM="MINGW64"
         C:\msys64\usr\bin\bash -l -c "pacman -S --noconfirm mingw-w64-x86_64-glib2"
-        C:\msys64\usr\bin\bash -l -c "cd /c/projects/mdbtools && autoreconf -i -f"
+        C:\msys64\usr\bin\bash -l -c "cd /c/projects/mdbtools && autoreconf -i -f -Wno-portability"
         C:\msys64\usr\bin\bash -l -c "cd /c/projects/mdbtools && ./configure --disable-man --disable-silent-rules"
         C:\msys64\usr\bin\bash -l -c "cd /c/projects/mdbtools && make"
       }
       else
       {
         C:\cygwin64\setup-x86_64.exe -qP libglib2.0-devel
-        C:\cygwin64\bin\sh -lc "cd /cygdrive/c/projects/mdbtools && autoreconf -i -f"
+        C:\cygwin64\bin\sh -lc "cd /cygdrive/c/projects/mdbtools && autoreconf -i -f -Wno-portability"
         C:\cygwin64\bin\sh -lc "cd /cygdrive/c/projects/mdbtools && ./configure --disable-man --disable-silent-rules"
         C:\cygwin64\bin\sh -lc "cd /cygdrive/c/projects/mdbtools && make"
       }