diff --git a/org.eclipse.xtext.ide.tests/build.gradle b/org.eclipse.xtext.ide.tests/build.gradle
index 2455c4f0b..44b729e38 100644
--- a/org.eclipse.xtext.ide.tests/build.gradle
+++ b/org.eclipse.xtext.ide.tests/build.gradle
@@ -29,4 +29,25 @@ task generateTestLanguages(type: XtextGeneratorTask) {
 	workflow = file('testlang-src/org/eclipse/xtext/ide/tests/testlanguage/GenerateTestLanguage.mwe2')
 	inputs.file 'testlang-src/org/eclipse/xtext/ide/tests/testlanguage/TestLanguage.xtext'
 	outputs.dir 'testlang-src-gen'
+	dependsOn 'processTestResources'
+}
+
+tasks.getByName('compileTestJava') {
+	mustRunAfter 'generateTestLanguages'
+}
+
+tasks.getByName('compileJava') {
+	mustRunAfter 'generateTestLanguages'
+}
+
+if (tasks.findByName('generateTestXtext')) {
+	tasks.getByName('generateTestXtext') {
+		mustRunAfter 'generateTestLanguages'
+	}
+}
+
+if (tasks.findByName('generateXtext')) {
+	tasks.getByName('generateXtext') {
+		mustRunAfter 'generateTestLanguages'
+	}
 }
diff --git a/org.eclipse.xtext.testlanguages/build.gradle b/org.eclipse.xtext.testlanguages/build.gradle
index 3b0b22cea..9726f55bd 100644
--- a/org.eclipse.xtext.testlanguages/build.gradle
+++ b/org.eclipse.xtext.testlanguages/build.gradle
@@ -14,4 +14,26 @@ sourceSets.mwe2.runtimeClasspath += processResources.outputs.files
 task generateTestLanguages(type: XtextGeneratorTask) {
 	workflow = file('src/org/eclipse/xtext/testlanguages/GenerateTestLanguages.mwe2')
 	outputs.dir 'src-gen'
+	dependsOn 'processTestResources'
 }
+
+tasks.getByName('compileTestJava') {
+	mustRunAfter 'generateTestLanguages'
+}
+
+tasks.getByName('compileJava') {
+	mustRunAfter 'generateTestLanguages'
+}
+
+if (tasks.findByName('generateTestXtext')) {
+	tasks.getByName('generateTestXtext') {
+		mustRunAfter 'generateTestLanguages'
+	}
+}
+
+if (tasks.findByName('generateXtext')) {
+	tasks.getByName('generateXtext') {
+		mustRunAfter 'generateTestLanguages'
+	}
+}
+
diff --git a/org.eclipse.xtext.tests/build.gradle b/org.eclipse.xtext.tests/build.gradle
index f5294810c..5003fbf60 100644
--- a/org.eclipse.xtext.tests/build.gradle
+++ b/org.eclipse.xtext.tests/build.gradle
@@ -38,8 +38,30 @@ sourcesJar.from sourceSets.mwe2.allSource
 task generateTestLanguages(type: XtextGeneratorTask) {
 	workflow = file('src/org/eclipse/xtext/GenerateAllTestLanguages.mwe2')
 	outputs.dir 'src-gen'
+	dependsOn 'processTestResources'
 }
 
+tasks.getByName('compileTestJava') {
+	mustRunAfter 'generateTestLanguages'
+}
+
+tasks.getByName('compileJava') {
+	mustRunAfter 'generateTestLanguages'
+}
+
+if (tasks.findByName('generateTestXtext')) {
+	tasks.getByName('generateTestXtext') {
+		mustRunAfter 'generateTestLanguages'
+	}
+}
+
+if (tasks.findByName('generateXtext')) {
+	tasks.getByName('generateXtext') {
+		mustRunAfter 'generateTestLanguages'
+	}
+}
+
+
 test {
 	exclude 'org.eclipse.xtext.serializer.contextFinderTest.NestedTypeRecursiveTest.class'
 	exclude '**/*Suite.class'