diff --git a/build.gradle b/build.gradle
index 35b05c0..60a856a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -40,7 +40,7 @@ final String proj_application_main = "${proj_package}.ServerMain"
 
 final String proj_version_base = VERSION
 final String proj_version_delta = VERSION_DELTA
-final String proj_version_use_delta = Boolean.parseBoolean(VERSION_DELTA)
+final boolean proj_version_use_delta = Boolean.parseBoolean(USE_DELTA)
 String proj_version = proj_version_base
 if (proj_version_use_delta) proj_version += "-δ${proj_version_delta}"
 if (proj_git) proj_version += "+git.${proj_commit.substring(0, 8)}" + (proj_clean?"":".δ")
@@ -120,7 +120,7 @@ buildConfig {
 	packageName(proj_package)
 	
 	buildConfigField('String', 'VERSION', "\"${proj_version}\"")
-	buildConfigField('String', 'VERSION_DELTA', "\"${proj_version_delta}\"")
+	buildConfigField('String', 'VERSION_DELTA', proj_version_use_delta ? "\"${proj_version_delta}\"" : "null")
 	buildConfigField('String', 'CODENAME', "\"${proj_version_codename}\"")
 	buildConfigField('long', 'CODE_TIMESTAMP', "${proj_code_time}L")
 	buildConfigField('String',  'COMMIT', proj_git ? "\"${proj_commit}\"" : "null")