diff --git a/tests/tcg/sh4/Makefile.target b/tests/tcg/sh4/Makefile.target
index 0e96aeff16..620ccc23c1 100644
--- a/tests/tcg/sh4/Makefile.target
+++ b/tests/tcg/sh4/Makefile.target
@@ -18,3 +18,7 @@ run-linux-test: linux-test
 	$(call skip-test, $<, "BROKEN")
 run-plugin-linux-test-with-%:
 	$(call skip-test, $<, "BROKEN")
+
+# This test is currently unreliable: https://gitlab.com/qemu-project/qemu/-/issues/856
+run-plugin-threadcount-with-%:
+	$(call skip-test, $<, "BROKEN")