diff --git a/Makefile.decl b/Makefile.decl
index 9ea9528..b6072e6 100644
--- a/Makefile.decl
+++ b/Makefile.decl
@@ -3,6 +3,7 @@ NULL =
 TEST_SUPPRESSIONS = $(top_builddir)/build/valgrind-suppressions
 
 perform-memcheck: $(TEST_PROGS) $(TEST_SUPPRESSIONS)
+	@make -C $(top_builddir)/build all
 	@for test in $(TEST_PROGS); do \
 		G_SLICE=always-malloc libtool --mode=execute \
 			valgrind --trace-children=no --gen-suppressions=all \
@@ -23,6 +24,5 @@ coverage:
 clear-coverage:
 	$(LCOV) --directory . --zerocounters
 
-.PHONY: coverage
 endif
 	
\ No newline at end of file
diff --git a/build/unknown.supp b/build/unknown.supp
index 314570c..b57beb3 100644
--- a/build/unknown.supp
+++ b/build/unknown.supp
@@ -353,3 +353,14 @@
    fun:g_main_loop_run
    fun:gdbus_shared_thread_func
 }
+{
+   <insert_a_suppression_name_here>
+   Memcheck:Leak
+   ...
+   fun:g_set_error_literal
+   fun:g_cancellable_set_error_if_cancelled
+   fun:g_socket_receive_message
+   ...
+   fun:g_main_loop_run
+   fun:gdbus_shared_thread_func
+}