diff --git a/mastodon/build.gradle b/mastodon/build.gradle
index 76754943f..4bfccc6f9 100644
--- a/mastodon/build.gradle
+++ b/mastodon/build.gradle
@@ -19,8 +19,23 @@ android {
 		nightly{
 			storeFile = file("keystore/nightly_keystore.jks")
 			storePassword System.getenv("SIGNING_STORE_PASSWORD")
+			if (storePassword == null) {
+				Properties properties = new Properties()
+				properties.load(project.rootProject.file('local.properties').newDataInputStream())
+				storePassword = properties.getProperty('SIGNING_STORE_PASSWORD')
+			}
 			keyAlias System.getenv("SIGNING_KEY_ALIAS")
+			if (keyAlias == null) {
+				Properties properties = new Properties()
+				properties.load(project.rootProject.file('local.properties').newDataInputStream())
+				keyAlias = properties.getProperty('SIGNING_KEY_ALIAS')
+			}
 			keyPassword System.getenv("SIGNING_KEY_PASSWORD")
+			if (keyPassword == null) {
+				Properties properties = new Properties()
+				properties.load(project.rootProject.file('local.properties').newDataInputStream())
+				keyPassword = properties.getProperty('SIGNING_KEY_PASSWORD')
+			}
 		}
 	}