diff --git a/appveyor.yml b/appveyor.yml
index e928a53a0..e38fda457 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -8,7 +8,7 @@ build_script:
   - gradlew.bat --no-daemon assemble checkstyleMain checkstyleTest
 
 test_script:
-  - gradlew.bat --no-daemon headless allTests
+  - gradlew.bat --no-daemon headless test
 
 environment:
   JAVA_HOME: C:\Program Files\Java\jdk9  # Use 64-bit Java
diff --git a/build.gradle b/build.gradle
index a3636f538..e2dc4a3fe 100644
--- a/build.gradle
+++ b/build.gradle
@@ -132,6 +132,24 @@ test {
     }
 }
 
+
+task headless {
+    doLast {
+        println 'Setting headless mode properties.'
+        test {
+            systemProperties = [
+                    'testfx.robot': 'glass',
+                    'testfx.headless': 'true',
+                    'prism.order': 'sw',
+                    'prism.text': 't2k',
+            ]
+        }
+    }
+}
+
+// Makes sure that headless properties are set before running tests
+test.mustRunAfter headless
+
 asciidoctor {
     backends 'html5'
     sourceDir 'docs'
@@ -169,4 +187,4 @@ task copyStylesheets(type: Copy) {
 }
 asciidoctor.dependsOn copyStylesheets
 
-defaultTasks 'clean', 'test', 'asciidoctor', 'checkstyleMain', 'checkstyleTest'
+defaultTasks 'clean', 'headless', 'test', 'asciidoctor', 'checkstyleMain', 'checkstyleTest'