diff --git a/tests/iio_adi_xflow_check.c b/tests/iio_adi_xflow_check.c
index ee9aeea5c..b9867601e 100644
--- a/tests/iio_adi_xflow_check.c
+++ b/tests/iio_adi_xflow_check.c
@@ -194,7 +194,7 @@ static struct iio_context *scan(void)
 		fprintf(stderr, "Multiple contexts found. Please select one using --uri:\n");
 
 		for (i = 0; i < (size_t) ret; i++) {
-			fprintf(stderr, "\t%d: %s [%s]\n", i,
+			fprintf(stderr, "\t%u: %s [%s]\n", i,
 				iio_context_info_get_description(info[i]),
 				iio_context_info_get_uri(info[i]));
 		}
diff --git a/tests/iio_attr.c b/tests/iio_attr.c
index cec667ce4..d751ed50e 100644
--- a/tests/iio_attr.c
+++ b/tests/iio_attr.c
@@ -156,7 +156,7 @@ static struct iio_context * autodetect_context(bool gen_code)
 	} else {
 		fprintf(stderr, "Multiple contexts found. Please select one using --uri:\n");
 		for (i = 0; i < (size_t) ret; i++) {
-			fprintf(stderr, "\t%d: %s [%s]\n",
+			fprintf(stderr, "\t%u: %s [%s]\n",
 					i, iio_context_info_get_description(info[i]),
 					iio_context_info_get_uri(info[i]));
 		}
diff --git a/tests/iio_info.c b/tests/iio_info.c
index 3222d310b..da06ab947 100644
--- a/tests/iio_info.c
+++ b/tests/iio_info.c
@@ -120,7 +120,7 @@ static void scan(void)
 	printf("Available contexts:\n");
 
 	for (i = 0; i < (size_t) ret; i++) {
-		printf("\t%d: %s [%s]\n", i,
+		printf("\t%u: %s [%s]\n", i,
 			iio_context_info_get_description(info[i]),
 			iio_context_info_get_uri(info[i]));
 	}
@@ -166,7 +166,7 @@ static struct iio_context * autodetect_context(void)
 		fprintf(stderr, "Multiple contexts found. Please select one using --uri:\n");
 
 		for (i = 0; i < (size_t) ret; i++) {
-			fprintf(stderr, "\t%d: %s [%s]\n", i,
+			fprintf(stderr, "\t%u: %s [%s]\n", i,
 				iio_context_info_get_description(info[i]),
 				iio_context_info_get_uri(info[i]));
 		}
diff --git a/tests/iio_readdev.c b/tests/iio_readdev.c
index fbe79f844..a61fb308e 100644
--- a/tests/iio_readdev.c
+++ b/tests/iio_readdev.c
@@ -236,7 +236,7 @@ static struct iio_context *scan(void)
 		fprintf(stderr, "Multiple contexts found. Please select one using --uri:\n");
 
 		for (i = 0; i < (size_t) ret; i++) {
-			fprintf(stderr, "\t%d: %s [%s]\n", i,
+			fprintf(stderr, "\t%u: %s [%s]\n", i,
 				iio_context_info_get_description(info[i]),
 				iio_context_info_get_uri(info[i]));
 		}
diff --git a/tests/iio_writedev.c b/tests/iio_writedev.c
index 7e27fa431..de6c6ab5f 100644
--- a/tests/iio_writedev.c
+++ b/tests/iio_writedev.c
@@ -245,7 +245,7 @@ static struct iio_context *scan(void)
 		fprintf(stderr, "Multiple contexts found. Please select one using --uri:\n");
 
 		for (i = 0; i < (size_t) ret; i++) {
-			fprintf(stderr, "\t%d: %s [%s]\n", i,
+			fprintf(stderr, "\t%u: %s [%s]\n", i,
 				iio_context_info_get_description(info[i]),
 				iio_context_info_get_uri(info[i]));
 		}