diff --git a/.travis.yml b/.travis.yml
index cec58d561..f793819ae 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -288,7 +288,7 @@ script:
       export CXX=g++-5 &&
       export CC=gcc-5 &&
       cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_FLAGS="-Werror" -DCMAKE_CXX_STANDARD=11 -Dbuild_tests=ON -Dbuild_examples=ON -Dbuild_tools=ON -Dpython-bindings=ON -G Ninja .. &&
-      cmake --build . -- -j2;
+      cmake --build . --parallel 3;
     fi
   - cd ..
 
diff --git a/appveyor.yml b/appveyor.yml
index 41635c47f..3b6b3d483 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -93,7 +93,7 @@ build_script:
   - mkdir build && cd build
   - if defined cmake (
     cmake -DCMAKE_CXX_STANDARD=11 -Dbuild_tests=ON -Dbuild_examples=ON -Dbuild_tools=ON -Dpython-bindings=%python% -Dboost-python-module-name="python" -Dskip-python-runtime-test=true -DPython_ADDITIONAL_VERSIONS="2.7" -G "Visual Studio 15 2017 Win64" .. &&
-    cmake --build . --config Release -- -verbosity:minimal
+    cmake --build . --config Release --parallel %NUMBER_OF_PROCESSORS% -- -verbosity:minimal
     )
 
 test_script: