diff --git a/lib/prompt-init b/lib/prompt-init
index ae8a5ea..3bf7c01 100755
--- a/lib/prompt-init
+++ b/lib/prompt-init
@@ -9,7 +9,7 @@ which ddcutil > /dev/null
 if [[ $? -eq 0 ]]; then
 	local I2C_IDS=($(ddcutil detect --terse | grep "I2C bus" | sed "s/^.*-//"))
 	mkdir -p $XDG_RUNTIME_DIR/over
-	echo ${(j|:|)I2C_IDS} > $XDG_RUNTIME_DIR/over/monitors-i2c
+	echo ${(j|:|)I2C_IDS} >! $XDG_RUNTIME_DIR/over/monitors-i2c
 fi
 
 if [[ -a "$OVER_PROMPT_CFG" ]]; then