diff --git a/tools/iio/iio_utils.c b/tools/iio/iio_utils.c
index 1dcdf03955cb81b26b4fd156472fa9380a4803bb..a95270f3335376ca46f494ba8190a9343e8bffea 100644
--- a/tools/iio/iio_utils.c
+++ b/tools/iio/iio_utils.c
@@ -168,7 +168,7 @@ int iioutils_get_type(unsigned *is_signed, unsigned *bytes, unsigned *bits_used,
 			if (*bits_used == 64)
 				*mask = ~0;
 			else
-				*mask = (1 << *bits_used) - 1;
+				*mask = (1ULL << *bits_used) - 1;
 
 			*is_signed = (signchar == 's');
 			if (fclose(sysfsfp)) {