diff --git a/package/verification-template/build.gradle b/package/verification-template/build.gradle
index 48fb73fb3..0957dd5e4 100644
--- a/package/verification-template/build.gradle
+++ b/package/verification-template/build.gradle
@@ -107,5 +107,9 @@ task verifyAll {
 	doLast {
 		// This causes resolution (and therefore verification) of the configuration
 		configurations.thirdParty.asPath
+
+		if (file("build.gradle").text =~ /(?m)^ /) {
+			throw new RuntimeException("gradle files should be indented with tabs")
+		}
 	}
 }