diff --git a/tests/ztest/include/ztest.h b/tests/ztest/include/ztest.h
index 2f0601f482c..f18d572d564 100644
--- a/tests/ztest/include/ztest.h
+++ b/tests/ztest/include/ztest.h
@@ -32,6 +32,7 @@
 #define CONFIG_ZTEST_ASSERT_VERBOSE 1
 #define CONFIG_ZTEST_MOCKING
 #define CONFIG_MICROKERNEL 1
+#define CONFIG_NUM_COOP_PRIORITIES 16
 /* FIXME: Properly integrate with Zephyr's arch specific code */
 #define CONFIG_X86 1
 #define PRINT printf