diff --git a/functions.sh.in b/functions.sh.in
index 719b354..4bdda5d 100644
--- a/functions.sh.in
+++ b/functions.sh.in
@@ -175,7 +175,7 @@ enable_colors() {
 	BLUE="\033[1;34m"
 }
 
-if [ -n "$USE_COLORS" ]; then
+if [ -n "$USE_COLORS" ] && [ -t 1 ]; then
 	enable_colors
 else
 	disable_colors