diff --git a/initializr-generator/src/main/resources/templates/starter-build.gradle b/initializr-generator/src/main/resources/templates/starter-build.gradle
index f381e9d7..a952f36a 100644
--- a/initializr-generator/src/main/resources/templates/starter-build.gradle
+++ b/initializr-generator/src/main/resources/templates/starter-build.gradle
@@ -7,8 +7,8 @@ buildscript {
 	repositories {
 		mavenCentral()
 		{{^isRelease}}
-		maven { url "https://repo.spring.io/snapshot" }
-		maven { url "https://repo.spring.io/milestone" }
+		maven { url 'https://repo.spring.io/snapshot' }
+		maven { url 'https://repo.spring.io/milestone' }
 		{{/isRelease}}
 	}
 	dependencies {
@@ -49,21 +49,21 @@ version = '{{version}}'
 sourceCompatibility = '{{javaVersion}}'{{#kotlin}}
 compileKotlin {
 	kotlinOptions {
-		freeCompilerArgs = ["-Xjsr305=strict"]{{#java8OrLater}}
-		jvmTarget = "1.8"{{/java8OrLater}}
+		freeCompilerArgs = ['-Xjsr305=strict']{{#java8OrLater}}
+		jvmTarget = '1.8'{{/java8OrLater}}
 	}
 }
 compileTestKotlin {
 	kotlinOptions {
-		freeCompilerArgs = ["-Xjsr305=strict"]{{#java8OrLater}}
-		jvmTarget = "1.8"{{/java8OrLater}}
+		freeCompilerArgs = ['-Xjsr305=strict']{{#java8OrLater}}
+		jvmTarget = '1.8'{{/java8OrLater}}
 	}
 }{{/kotlin}}
 
 repositories {
 	mavenCentral()
 	{{#repositoryValues}}
-	maven { url "{{value.url}}" }
+	maven { url '{{value.url}}' }
 	{{/repositoryValues}}
 }
 
diff --git a/initializr-generator/src/test/java/io/spring/initializr/test/generator/GradleBuildAssert.java b/initializr-generator/src/test/java/io/spring/initializr/test/generator/GradleBuildAssert.java
index de06ddab..0e684670 100644
--- a/initializr-generator/src/test/java/io/spring/initializr/test/generator/GradleBuildAssert.java
+++ b/initializr-generator/src/test/java/io/spring/initializr/test/generator/GradleBuildAssert.java
@@ -60,7 +60,7 @@ public class GradleBuildAssert {
 	}
 
 	public GradleBuildAssert hasRepository(String url) {
-		return contains("maven { url \"" + url + "\" }");
+		return contains("maven { url '" + url + "' }");
 	}
 
 	/**
diff --git a/initializr-generator/src/test/resources/project/gradle/kotlin-java11-build.gradle.gen b/initializr-generator/src/test/resources/project/gradle/kotlin-java11-build.gradle.gen
index ca4e8886..ceb9b0eb 100644
--- a/initializr-generator/src/test/resources/project/gradle/kotlin-java11-build.gradle.gen
+++ b/initializr-generator/src/test/resources/project/gradle/kotlin-java11-build.gradle.gen
@@ -24,14 +24,14 @@ version = '0.0.1-SNAPSHOT'
 sourceCompatibility = '11'
 compileKotlin {
 	kotlinOptions {
-		freeCompilerArgs = ["-Xjsr305=strict"]
-		jvmTarget = "1.8"
+		freeCompilerArgs = ['-Xjsr305=strict']
+		jvmTarget = '1.8'
 	}
 }
 compileTestKotlin {
 	kotlinOptions {
-		freeCompilerArgs = ["-Xjsr305=strict"]
-		jvmTarget = "1.8"
+		freeCompilerArgs = ['-Xjsr305=strict']
+		jvmTarget = '1.8'
 	}
 }
 
diff --git a/initializr-generator/src/test/resources/project/gradle/repositories-build.gradle.gen b/initializr-generator/src/test/resources/project/gradle/repositories-build.gradle.gen
index 93a20b34..c4a67760 100644
--- a/initializr-generator/src/test/resources/project/gradle/repositories-build.gradle.gen
+++ b/initializr-generator/src/test/resources/project/gradle/repositories-build.gradle.gen
@@ -21,8 +21,8 @@ sourceCompatibility = '1.8'
 
 repositories {
 	mavenCentral()
-	maven { url "https://example.com/foo" }
-	maven { url "https://example.com/bar" }
+	maven { url 'https://example.com/foo' }
+	maven { url 'https://example.com/bar' }
 }
 
 
diff --git a/initializr-generator/src/test/resources/project/gradle/repositories-milestone-build.gradle.gen b/initializr-generator/src/test/resources/project/gradle/repositories-milestone-build.gradle.gen
index bb3c910a..e33dfe35 100644
--- a/initializr-generator/src/test/resources/project/gradle/repositories-milestone-build.gradle.gen
+++ b/initializr-generator/src/test/resources/project/gradle/repositories-milestone-build.gradle.gen
@@ -4,8 +4,8 @@ buildscript {
 	}
 	repositories {
 		mavenCentral()
-		maven { url "https://repo.spring.io/snapshot" }
-		maven { url "https://repo.spring.io/milestone" }
+		maven { url 'https://repo.spring.io/snapshot' }
+		maven { url 'https://repo.spring.io/milestone' }
 	}
 	dependencies {
 		classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
@@ -23,8 +23,8 @@ sourceCompatibility = '1.8'
 
 repositories {
 	mavenCentral()
-	maven { url "https://repo.spring.io/snapshot" }
-	maven { url "https://repo.spring.io/milestone" }
+	maven { url 'https://repo.spring.io/snapshot' }
+	maven { url 'https://repo.spring.io/milestone' }
 }
 
 
diff --git a/initializr-generator/src/test/resources/project/kotlin/previous/build.gradle.gen b/initializr-generator/src/test/resources/project/kotlin/previous/build.gradle.gen
index 582c250a..77f3325b 100644
--- a/initializr-generator/src/test/resources/project/kotlin/previous/build.gradle.gen
+++ b/initializr-generator/src/test/resources/project/kotlin/previous/build.gradle.gen
@@ -23,14 +23,14 @@ version = '0.0.1-SNAPSHOT'
 sourceCompatibility = '1.8'
 compileKotlin {
 	kotlinOptions {
-		freeCompilerArgs = ["-Xjsr305=strict"]
-		jvmTarget = "1.8"
+		freeCompilerArgs = ['-Xjsr305=strict']
+		jvmTarget = '1.8'
 	}
 }
 compileTestKotlin {
 	kotlinOptions {
-		freeCompilerArgs = ["-Xjsr305=strict"]
-		jvmTarget = "1.8"
+		freeCompilerArgs = ['-Xjsr305=strict']
+		jvmTarget = '1.8'
 	}
 }
 
diff --git a/initializr-generator/src/test/resources/project/kotlin/standard/build.gradle.gen b/initializr-generator/src/test/resources/project/kotlin/standard/build.gradle.gen
index 0f047b6f..8bea479a 100644
--- a/initializr-generator/src/test/resources/project/kotlin/standard/build.gradle.gen
+++ b/initializr-generator/src/test/resources/project/kotlin/standard/build.gradle.gen
@@ -24,14 +24,14 @@ version = '0.0.1-SNAPSHOT'
 sourceCompatibility = '1.8'
 compileKotlin {
 	kotlinOptions {
-		freeCompilerArgs = ["-Xjsr305=strict"]
-		jvmTarget = "1.8"
+		freeCompilerArgs = ['-Xjsr305=strict']
+		jvmTarget = '1.8'
 	}
 }
 compileTestKotlin {
 	kotlinOptions {
-		freeCompilerArgs = ["-Xjsr305=strict"]
-		jvmTarget = "1.8"
+		freeCompilerArgs = ['-Xjsr305=strict']
+		jvmTarget = '1.8'
 	}
 }
 
diff --git a/initializr-generator/src/test/resources/project/kotlin/standard/war-build.gradle.gen b/initializr-generator/src/test/resources/project/kotlin/standard/war-build.gradle.gen
index 84ca6c4c..022140ab 100644
--- a/initializr-generator/src/test/resources/project/kotlin/standard/war-build.gradle.gen
+++ b/initializr-generator/src/test/resources/project/kotlin/standard/war-build.gradle.gen
@@ -25,14 +25,14 @@ version = '0.0.1-SNAPSHOT'
 sourceCompatibility = '1.8'
 compileKotlin {
 	kotlinOptions {
-		freeCompilerArgs = ["-Xjsr305=strict"]
-		jvmTarget = "1.8"
+		freeCompilerArgs = ['-Xjsr305=strict']
+		jvmTarget = '1.8'
 	}
 }
 compileTestKotlin {
 	kotlinOptions {
-		freeCompilerArgs = ["-Xjsr305=strict"]
-		jvmTarget = "1.8"
+		freeCompilerArgs = ['-Xjsr305=strict']
+		jvmTarget = '1.8'
 	}
 }