diff --git a/src/main/java/com/android/tools/r8/shaking/ProguardMemberRuleReturnValue.java b/src/main/java/com/android/tools/r8/shaking/ProguardMemberRuleReturnValue.java
index ba5072c..726ab9d 100644
--- a/src/main/java/com/android/tools/r8/shaking/ProguardMemberRuleReturnValue.java
+++ b/src/main/java/com/android/tools/r8/shaking/ProguardMemberRuleReturnValue.java
@@ -154,9 +154,8 @@
 
       case VALUE_RANGE:
         if (valueType.isReferenceType()) {
-          return nullability.isDefinitelyNull()
-              ? abstractValueFactory.createUncheckedNullValue()
-              : AbstractValue.unknown();
+          assert false;
+          return AbstractValue.unknown();
         }
         return longInterval.isSingleValue()
             ? abstractValueFactory.createSingleNumberValue(
diff --git a/src/test/java/com/android/tools/r8/R8TestBuilder.java b/src/test/java/com/android/tools/r8/R8TestBuilder.java
index 8cd7133..238594e 100644
--- a/src/test/java/com/android/tools/r8/R8TestBuilder.java
+++ b/src/test/java/com/android/tools/r8/R8TestBuilder.java
@@ -425,8 +425,8 @@
   public T enableAssumeNotNullAnnotations(String annotationPackageName) {
     return addInternalKeepRules(
         "-assumevalues class * {",
-        "  @" + annotationPackageName + ".AssumeNotNull *** * return 1;",
-        "  @" + annotationPackageName + ".AssumeNotNull *** *(...) return 1;",
+        "  @" + annotationPackageName + ".AssumeNotNull *** * return _NONNULL_;",
+        "  @" + annotationPackageName + ".AssumeNotNull *** *(...) return _NONNULL_;",
         "}");
   }
 
diff --git a/src/test/java/com/android/tools/r8/ir/optimize/membervaluepropagation/AssumeNotNullTest.java b/src/test/java/com/android/tools/r8/ir/optimize/membervaluepropagation/AssumeNotNullTest.java
index cb0e949..e592d03 100644
--- a/src/test/java/com/android/tools/r8/ir/optimize/membervaluepropagation/AssumeNotNullTest.java
+++ b/src/test/java/com/android/tools/r8/ir/optimize/membervaluepropagation/AssumeNotNullTest.java
@@ -47,10 +47,10 @@
         .addKeepMainRule(Main.class)
         .addKeepRules(
             "-" + flavor + " class " + Factory.class.getTypeName() + " {",
-            "  java.lang.Object create() return 1;",
+            "  java.lang.Object create() return _NONNULL_;",
             "}",
             "-" + flavor + " class " + Singleton.class.getTypeName() + " {",
-            "  java.lang.Object INSTANCE return 1;",
+            "  java.lang.Object INSTANCE return _NONNULL_;",
             "}")
         .enableInliningAnnotations()
         .setMinApi(parameters)