diff --git a/.travis/build.sh b/.travis/build.sh
index 58aecea0e..b53ff2d28 100755
--- a/.travis/build.sh
+++ b/.travis/build.sh
@@ -19,5 +19,7 @@ for APK in ${APKS[@]}; do
     APKDEST="$DEST/$APKNAME"
 
     ${TOOLS}/zipalign -v -p 4 $APK $APKDEST
-    [[ -z "$TRAVIS_PULL_REQUEST" ]] && ${TOOLS}/apksigner sign --ks $STORE_PATH --ks-key-alias $STORE_ALIAS --ks-pass env:STORE_PASS --key-pass env:KEY_PASS $APKDEST
+    if [ "$TRAVIS_PULL_REQUEST" = "false" ]; then
+        ${TOOLS}/apksigner sign --ks $STORE_PATH --ks-key-alias $STORE_ALIAS --ks-pass env:STORE_PASS --key-pass env:KEY_PASS $APKDEST
+    fi
 done