diff --git a/unittests/POSIX/Disabled_Tests b/unittests/POSIX/Disabled_Tests
index 7057540eb..9850a4b94 100644
--- a/unittests/POSIX/Disabled_Tests
+++ b/unittests/POSIX/Disabled_Tests
@@ -375,3 +375,6 @@ conformance-interfaces-sigaction-25-23.test
 conformance-interfaces-sigaction-25-24.test
 conformance-interfaces-sigaction-25-25.test
 conformance-interfaces-sigaction-25-26.test
+
+# This test is flakey on the interpreter
+conformance-behavior-WIFEXITED-1-3.test
diff --git a/unittests/POSIX/Known_Failures b/unittests/POSIX/Known_Failures
index 0104fbe87..eb1ee754b 100644
--- a/unittests/POSIX/Known_Failures
+++ b/unittests/POSIX/Known_Failures
@@ -387,3 +387,6 @@ conformance-interfaces-sigaction-25-23.test
 conformance-interfaces-sigaction-25-24.test
 conformance-interfaces-sigaction-25-25.test
 conformance-interfaces-sigaction-25-26.test
+
+# This test is flakey on the interpreter
+conformance-behavior-WIFEXITED-1-3.test