diff --git a/impagina b/impagina
index b91a380..834a784 100755
--- a/impagina
+++ b/impagina
@@ -10,7 +10,7 @@ n="$(pdftk "$input" dump_data | grep NumberOfPages | cut -d' ' -f2)"
 # Add empty pages
 echo .bp | groff -T pdf > "$empty"
 
-pdftk F=$input E="$empty" cat F1-$n $(for x in $(seq 1 $((4-n%4))); do printf 'E1 '; done) output $inputMul4
+pdftk F="$input" E="$empty" cat F1-$n "$(for x in $(seq 1 $((4-n%4))); do printf 'E1 '; done)" output "$inputMul4"
 
 # Generate alternating page ranges
 n=$((n+(4-n%4)))