diff --git a/libsigrok4DSL/hardware/DSL/dscope.c b/libsigrok4DSL/hardware/DSL/dscope.c
index 5f1e6732..d418eb13 100644
--- a/libsigrok4DSL/hardware/DSL/dscope.c
+++ b/libsigrok4DSL/hardware/DSL/dscope.c
@@ -371,6 +371,11 @@ static GSList *scan(GSList *options)
             }
 
             g_free(firmware);
+            
+            libusb_unref_device(device_handle);
+#ifdef _WIN32
+            libusb_unref_device(device_handle);
+#endif
 
             sr_info("Waitting for device reconnect, name:\"%s\"", prof->model);            
 		}
diff --git a/libsigrok4DSL/hardware/DSL/dslogic.c b/libsigrok4DSL/hardware/DSL/dslogic.c
index de53bb94..b6e138aa 100644
--- a/libsigrok4DSL/hardware/DSL/dslogic.c
+++ b/libsigrok4DSL/hardware/DSL/dslogic.c
@@ -459,6 +459,11 @@ static GSList *scan(GSList *options)
 
             free(firmware);
 
+            libusb_unref_device(device_handle);
+#ifdef _WIN32
+            libusb_unref_device(device_handle);
+#endif
+
             sr_info("Waitting for device reconnect, name:\"%s\"", prof->model);
 		}
 	}