diff --git a/patcher/CommonPatcher b/patcher/CommonPatcher
index 3bd6600..1dc3a92 100644
--- a/patcher/CommonPatcher
+++ b/patcher/CommonPatcher
@@ -128,7 +128,8 @@ detect_outfd () {
 }
 
 detect_bootmode () {
-	ps | grep zygote | grep -qv grep && BOOTMODE=true || BOOTMODE=false
+	[ -z ${BOOTMODE} ] && BOOTMODE=false
+	${BOOTMODE} || ps | grep zygote | grep -qv grep && BOOTMODE=true
 	${BOOTMODE} || ps -A | grep zygote | grep -qv grep && BOOTMODE=true
 }
 
diff --git a/uninstaller/META-INF/com/google/android/update-binary b/uninstaller/META-INF/com/google/android/update-binary
index cd81c0c..86f8312 100644
--- a/uninstaller/META-INF/com/google/android/update-binary
+++ b/uninstaller/META-INF/com/google/android/update-binary
@@ -35,7 +35,8 @@ Vending
 WhisperPush"
 
 detect_bootmode () {
-	ps | grep zygote | grep -qv grep && BOOTMODE=true || BOOTMODE=false
+	[ -z ${BOOTMODE} ] && BOOTMODE=false
+	${BOOTMODE} || ps | grep zygote | grep -qv grep && BOOTMODE=true
 	${BOOTMODE} || ps -A | grep zygote | grep -qv grep && BOOTMODE=true
 }