diff --git a/reactos/drivers/input/sermouse/detect.c b/reactos/drivers/input/sermouse/detect.c
index f7c8273849f..f27ee82d46a 100644
--- a/reactos/drivers/input/sermouse/detect.c
+++ b/reactos/drivers/input/sermouse/detect.c
@@ -222,12 +222,15 @@ SermouseDetectLegacyDevice(
 				case '3':
 					INFO_(SERMOUSE, "Microsoft Mouse with 3-buttons detected\n");
 					MouseType = mtLogitech;
+					break;
 				case 'Z':
 					INFO_(SERMOUSE, "Microsoft Wheel Mouse detected\n");
 					MouseType = mtWheelZ;
+					break;
 				default:
 					INFO_(SERMOUSE, "Microsoft Mouse with 2-buttons detected\n");
 					MouseType = mtMicrosoft;
+					break;
 			}
 			goto ByeBye;
 		}
diff --git a/reactos/drivers/serial/serenum/detect.c b/reactos/drivers/serial/serenum/detect.c
index a10356e9a4a..87af5890236 100644
--- a/reactos/drivers/serial/serenum/detect.c
+++ b/reactos/drivers/serial/serenum/detect.c
@@ -572,6 +572,7 @@ SerenumDetectLegacyDevice(
 					RtlInitUnicodeString(&DeviceDescription, L"Microsoft Mouse with 3-buttons");
 					SerenumInitMultiSzString(&HardwareIds, "*PNP0F08", NULL);
 					SerenumInitMultiSzString(&CompatibleIds, "SERIAL_MOUSE", NULL);
+					break;
 				default:
 					/* Hardware id: *PNP0F01
 					 * Compatible id: SERIAL_MOUSE
@@ -579,6 +580,7 @@ SerenumDetectLegacyDevice(
 					RtlInitUnicodeString(&DeviceDescription, L"Microsoft Mouse with 2-buttons or Microsoft Wheel Mouse");
 					SerenumInitMultiSzString(&HardwareIds, "*PNP0F01", NULL);
 					SerenumInitMultiSzString(&CompatibleIds, "SERIAL_MOUSE", NULL);
+					break;
 			}
 			Status = ReportDetectedDevice(DeviceObject,
 				&DeviceDescription, &DeviceId, &InstanceId, &HardwareIds, &CompatibleIds);