diff --git a/src/mm-iface-modem.c b/src/mm-iface-modem.c
index cbee740e..f0f10ce7 100644
--- a/src/mm-iface-modem.c
+++ b/src/mm-iface-modem.c
@@ -4067,6 +4067,7 @@ interface_initialization_step (InitializationContext *ctx)
                     ctx->self,
                     (GAsyncReadyCallback)load_supported_capabilities_ready,
                     ctx);
+                g_array_unref (supported_capabilities);
                 return;
             }