diff --git a/libs/libteletone/src/libteletone_detect.c b/libs/libteletone/src/libteletone_detect.c
index 8b1a792791..7bbdd697df 100644
--- a/libs/libteletone/src/libteletone_detect.c
+++ b/libs/libteletone/src/libteletone_detect.c
@@ -211,7 +211,7 @@ int teletone_multi_tone_detect (teletone_multi_tone_t *mt,
 								int16_t sample_buffer[],
 								int samples)
 {
-	int sample, limit, j, x = 0;
+	int sample, limit = 0, j, x = 0;
 	float v1, famp;
 	float eng_sum = 0, eng_all[TELETONE_MAX_TONES];
 	int gtest = 0, see_hit = 0;
@@ -224,6 +224,9 @@ int teletone_multi_tone_detect (teletone_multi_tone_t *mt,
 		} else {
 			limit = samples;
 		}
+		if (limit < 0 || limit > samples) {
+			limit = samples;
+		}
 
 		for (j = sample;  j < limit;  j++) {
 			famp = sample_buffer[j];