diff --git a/grace-gradle-plugin/src/main/groovy/org/grails/gradle/plugin/core/GrailsGradlePlugin.groovy b/grace-gradle-plugin/src/main/groovy/org/grails/gradle/plugin/core/GrailsGradlePlugin.groovy
index 720cb6a813..e378380ed3 100644
--- a/grace-gradle-plugin/src/main/groovy/org/grails/gradle/plugin/core/GrailsGradlePlugin.groovy
+++ b/grace-gradle-plugin/src/main/groovy/org/grails/gradle/plugin/core/GrailsGradlePlugin.groovy
@@ -674,6 +674,10 @@ class GrailsGradlePlugin extends GroovyPlugin {
         def projectType = getGrailsProjectType()
         def isPlugin = projectType == GrailsProjectType.PLUGIN
         def grailsAppDir = new File(project.projectDir, grailsAppDir).absolutePath
+        if (System.getProperty('os.name').startsWith('Windows')) {
+            projectDir = projectDir.replace('\\', '\\\\')
+            grailsAppDir = grailsAppDir.replace('\\', '\\\\')
+        }
         configScriptTask.inputs.property('name', projectName)
         configScriptTask.inputs.property('version', projectVersion)
         configScriptTask.doLast {