diff --git a/src/main/java/org/checkerframework/specimin/UnsolvedSymbolVisitor.java b/src/main/java/org/checkerframework/specimin/UnsolvedSymbolVisitor.java
index e4482a438..071eabe9a 100644
--- a/src/main/java/org/checkerframework/specimin/UnsolvedSymbolVisitor.java
+++ b/src/main/java/org/checkerframework/specimin/UnsolvedSymbolVisitor.java
@@ -1008,13 +1008,8 @@ public Visitable visit(ConstructorDeclaration node, Void arg) {
             (ClassOrInterfaceDeclaration) JavaParserUtil.getEnclosingClassLike(node);
         for (FieldDeclaration field : thisClass.getFields()) {
           for (VariableDeclarator variable : field.getVariables()) {
-            if (variable.getType().isClassOrInterfaceType()) {
-              solveSymbolsForClassOrInterfaceType(
-                  variable.getType().asClassOrInterfaceType(), false);
-            } else {
-              throw new RuntimeException(
-                  "fields can also have this type: " + variable.getType().getClass());
-            }
+            Type type = variable.getType();
+            resolveTypeExpr(type);
           }
         }
       }
diff --git a/src/main/resources/preservation_status.json b/src/main/resources/preservation_status.json
index d6fced59f..753420656 100644
--- a/src/main/resources/preservation_status.json
+++ b/src/main/resources/preservation_status.json
@@ -24,7 +24,7 @@
   "na-102": "PASS",
   "na-103": "PASS",
   "na-176": "PASS",
-  "na-323": "FAIL",
+  "na-323": "PASS",
   "na-347": "PASS",
   "na-389": "PASS",
   "na-705": "FAIL",
diff --git a/src/test/resources/nullaway-ctors/expected/com/example/Simple.java b/src/test/resources/nullaway-ctors/expected/com/example/Simple.java
index 11fd0c6d1..bb8c504bb 100644
--- a/src/test/resources/nullaway-ctors/expected/com/example/Simple.java
+++ b/src/test/resources/nullaway-ctors/expected/com/example/Simple.java
@@ -5,6 +5,8 @@ class Simple {
 
     private Foo bar;
 
+    private int x;
+
     public Simple() {
     }
 }
diff --git a/src/test/resources/nullaway-ctors/input/com/example/Simple.java b/src/test/resources/nullaway-ctors/input/com/example/Simple.java
index 243581d0f..e53d39207 100644
--- a/src/test/resources/nullaway-ctors/input/com/example/Simple.java
+++ b/src/test/resources/nullaway-ctors/input/com/example/Simple.java
@@ -5,6 +5,8 @@ class Simple {
 
     private Foo bar;
 
+    private int x;
+
     public Simple() {
         // No initialization of a field can change NullAway's output,
         // so the NullAway modularity model needs to preserve all fields