diff --git a/.travis.yml b/.travis.yml
index 7d0baaa7..7ba31114 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -201,4 +201,4 @@ install:
   - ./b2 headers
 
 script:
-  - ./b2 libs/fusion/test toolset=$TOOLSET cxxstd=$CXXSTD define=RUNNING_ON_TRAVIS=1
+  - ./b2 -j`(nproc || sysctl -n hw.ncpu) 2> /dev/null` libs/fusion/test toolset=$TOOLSET cxxstd=$CXXSTD define=RUNNING_ON_TRAVIS=1
diff --git a/appveyor.yml b/appveyor.yml
index efccd5f4..d671946a 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -71,4 +71,4 @@ install:
 build: off
 
 test_script:
-  - b2 libs/fusion/test toolset=%TOOLSET% define=RUNNING_ON_APPVEYOR=1
+  - b2 -j%NUMBER_OF_PROCESSORS% libs/fusion/test toolset=%TOOLSET% define=RUNNING_ON_APPVEYOR=1