diff --git a/tests/driver_ccs811/main.c b/tests/driver_ccs811/main.c
index f3e7ddb43c..6b666cb857 100644
--- a/tests/driver_ccs811/main.c
+++ b/tests/driver_ccs811/main.c
@@ -58,7 +58,7 @@ int main(void)
         }
 
         /* read the data and print them on success */
-        if (ccs811_read_iaq(&sensor, &tvoc, &eco2, 0, 0) != CCS811_OK) {
+        if (ccs811_read_iaq(&sensor, &tvoc, &eco2, 0, 0) == CCS811_OK) {
             printf("TVOC [ppb]: %d\neCO2 [ppm]: %d\n", tvoc, eco2);
             puts("+-------------------------------------+");
         }
diff --git a/tests/driver_ccs811_full/main.c b/tests/driver_ccs811_full/main.c
index 78e98e8ce5..85e202ca7d 100644
--- a/tests/driver_ccs811_full/main.c
+++ b/tests/driver_ccs811_full/main.c
@@ -89,7 +89,7 @@ int main(void)
         msg_receive(&msg);
 
         /* read the data */
-        if (ccs811_read_iaq(&sensor, &tvoc, &eco2, 0, 0) != CCS811_OK) {
+        if (ccs811_read_iaq(&sensor, &tvoc, &eco2, 0, 0) == CCS811_OK) {
             /* print values */
             printf("TVOC [ppb]: %d\neCO2 [ppm]: %d\n", tvoc, eco2);
             puts("+-------------------------------------+");