diff --git a/lib/compress.js b/lib/compress.js
index 89f99368..b4864fe4 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -10449,6 +10449,7 @@ Compressor.prototype.compress = function(node) {
                     var def = name.definition();
                     if (def.orig.length == 1 && fn.functions.has(name.name)) continue;
                     var sym = make_node(AST_SymbolRef, name, name);
+                    def.assignments++;
                     def.references.push(sym);
                     expr_loop.push(make_node(AST_Assign, var_def, {
                         operator: "=",
@@ -13104,7 +13105,9 @@ Compressor.prototype.compress = function(node) {
                 var sym = def.orig[0];
                 if (sym instanceof AST_SymbolCatch) return;
                 var ref = make_node(AST_SymbolRef, sym, flatten_var(sym));
-                ref.definition().references.push(ref);
+                def = ref.definition();
+                def.assignments++;
+                def.references.push(ref);
                 body.push(make_node(AST_SimpleStatement, sym, {
                     body: make_node(AST_Assign, sym, {
                         operator: "=",
diff --git a/test/compress/default-values.js b/test/compress/default-values.js
index 4d1d60b0..572a5d0c 100644
--- a/test/compress/default-values.js
+++ b/test/compress/default-values.js
@@ -2029,7 +2029,9 @@ issue_5222: {
     expect: {
         do {
             a = void 0,
-            [ a ] = [];
+            a = {
+                p: [ a ] = [],
+            };
         } while (console.log("PASS"));
         var a;
     }
diff --git a/test/compress/functions.js b/test/compress/functions.js
index 31be259c..19374b01 100644
--- a/test/compress/functions.js
+++ b/test/compress/functions.js
@@ -8014,3 +8014,35 @@ issue_5283: {
     }
     expect_stdout: "PASS"
 }
+
+issue_5290: {
+    options = {
+        functions: true,
+        inline: true,
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = 1;
+        while (a--) new function(b) {
+            switch (b) {
+              case b.p:
+              case console.log("PASS"):
+            }
+        }(function() {});
+    }
+    expect: {
+        var a = 1;
+        while (a--) {
+            b = void 0;
+            var b = function() {};
+            switch (b) {
+              case b.p:
+              case console.log("PASS"):
+            }
+        }
+    }
+    expect_stdout: "PASS"
+}