diff --git a/pdf-optimize b/pdf-optimize
index 0d72042..ee94899 100755
--- a/pdf-optimize
+++ b/pdf-optimize
@@ -103,8 +103,8 @@ ${bold}$output_path${normal}."
 		   -dNOPAUSE \
 		   -dQUIET \
 		   -dBATCH \
-		   -sOutputFile=$output_path \
-		   $input_path
+		   -sOutputFile="$output_path" \
+		   "$input_path"
 	else
 		echo "input_path=$input_path";
 		echo "output_path=$output_path";
@@ -117,8 +117,8 @@ ${bold}$output_path${normal}."
 		   -dPDFSETTINGS=/prepress \
 		   -dNOPAUSE \
 		   -dBATCH \
-		   -sOutputFile=$output_path \
-		   $input_path 
+		   -sOutputFile="$output_path" \
+		   "$input_path" 
 	fi
 	
 	# catching errors