diff --git a/utils/wesnoth-optipng b/utils/wesnoth-optipng
index 4bd78ff759d..60e1054f62e 100755
--- a/utils/wesnoth-optipng
+++ b/utils/wesnoth-optipng
@@ -35,7 +35,7 @@ total_original_size=0
 total_savings_size=0
 total_savings_filecount=0
 
-if [test -e "/proc/cpuinfo"] && [`grep processor /proc/cpuinfo | wc -l` -gt 1]; then
+if [ -e "/proc/cpuinfo"] && [`grep processor /proc/cpuinfo | wc -l` -gt 1]; then
         max_number_threads=`grep processor /proc/cpuinfo | wc -l`
 fi