diff --git a/Scripts/Functions/cli_getTTFont.sh b/Scripts/Functions/cli_getTTFont.sh
index 62c2ce9..2a3302a 100755
--- a/Scripts/Functions/cli_getTTFont.sh
+++ b/Scripts/Functions/cli_getTTFont.sh
@@ -36,9 +36,9 @@ function cli_getTTFont {
     local FONT_FILE=''
 
     # Define list of patterns used to build the list of TTF files.
-    FONT_PATTERNS[++((${#FONT_PATTERNS[*]}))]="/${1}\.ttf$"
-    FONT_PATTERNS[++((${#FONT_PATTERNS[*]}))]="sans\.ttf$"
-    FONT_PATTERNS[++((${#FONT_PATTERNS[*]}))]="\.ttf$"
+    FONT_PATTERNS[((++${#FONT_PATTERNS[*]}))]="/${1}\.ttf$"
+    FONT_PATTERNS[((++${#FONT_PATTERNS[*]}))]="sans\.ttf$"
+    FONT_PATTERNS[((++${#FONT_PATTERNS[*]}))]="\.ttf$"
 
     # Define directory location where fonts are installed in your
     # workstation.