diff --git a/Sources/OpenAPIRuntime/URICoder/Decoding/URIValueFromNodeDecoder.swift b/Sources/OpenAPIRuntime/URICoder/Decoding/URIValueFromNodeDecoder.swift
index 472aed8b..b197b82e 100644
--- a/Sources/OpenAPIRuntime/URICoder/Decoding/URIValueFromNodeDecoder.swift
+++ b/Sources/OpenAPIRuntime/URICoder/Decoding/URIValueFromNodeDecoder.swift
@@ -294,6 +294,9 @@ extension URIValueFromNodeDecoder {
             array = try rootValue(in: values)
         }
         guard array.count == 1 else {
+            if style == .simple {
+                return Substring(array.joined(separator: ","))
+            }
             let reason = array.isEmpty ? "an empty node" : "a node with multiple values"
             try throwMismatch("Cannot parse a value from \(reason).")
         }
diff --git a/Tests/OpenAPIRuntimeTests/URICoder/Decoder/Test_URIDecoder.swift b/Tests/OpenAPIRuntimeTests/URICoder/Decoder/Test_URIDecoder.swift
index fbc44d29..a98e91b5 100644
--- a/Tests/OpenAPIRuntimeTests/URICoder/Decoder/Test_URIDecoder.swift
+++ b/Tests/OpenAPIRuntimeTests/URICoder/Decoder/Test_URIDecoder.swift
@@ -80,4 +80,30 @@ final class Test_URIDecoder: Test_Runtime {
             XCTAssertEqual(decodedValue, nil)
         }
     }
+
+    func testDecoding_percentEncodedCommaToString() throws {
+        let decoder = URIDecoder(configuration: .simpleUnexplode)
+
+        do {
+            let decodedValue = try decoder.decode(
+                String.self,
+                forKey: "",
+                from: "foo%2C%20bar"
+            )
+            XCTAssertEqual(decodedValue, "foo, bar")
+        }
+    }
+
+    func testDecoding_nonPercentEncodedCommaToString() throws {
+        let decoder = URIDecoder(configuration: .simpleUnexplode)
+
+        do {
+            let decodedValue = try decoder.decode(
+                String.self,
+                forKey: "",
+                from: "foo, bar"
+            )
+            XCTAssertEqual(decodedValue, "foo, bar")
+        }
+    }
 }