diff --git a/gcp/src/main/java/org/apache/iceberg/gcp/gcs/GCSInputStream.java b/gcp/src/main/java/org/apache/iceberg/gcp/gcs/GCSInputStream.java
index d8b092e4e70a..fc09bafadbc8 100644
--- a/gcp/src/main/java/org/apache/iceberg/gcp/gcs/GCSInputStream.java
+++ b/gcp/src/main/java/org/apache/iceberg/gcp/gcs/GCSInputStream.java
@@ -117,7 +117,7 @@ public int read() throws IOException {
     readBytes.increment();
     readOperations.increment();
 
-    return singleByteBuffer.array()[0];
+    return singleByteBuffer.array()[0] & 0xFF;
   }
 
   @Override
diff --git a/gcp/src/test/java/org/apache/iceberg/gcp/gcs/GCSInputStreamTest.java b/gcp/src/test/java/org/apache/iceberg/gcp/gcs/GCSInputStreamTest.java
index 1a5200345b7a..733d9101869b 100644
--- a/gcp/src/test/java/org/apache/iceberg/gcp/gcs/GCSInputStreamTest.java
+++ b/gcp/src/test/java/org/apache/iceberg/gcp/gcs/GCSInputStreamTest.java
@@ -78,6 +78,22 @@ public void testRead() throws Exception {
     }
   }
 
+  @Test
+  public void testReadSingle() throws Exception {
+    BlobId uri = BlobId.fromGsUtilUri("gs://bucket/path/to/read.dat");
+    int i0 = 1;
+    int i1 = 255;
+    byte[] data = {(byte) i0, (byte) i1};
+
+    writeGCSData(uri, data);
+
+    try (SeekableInputStream in =
+        new GCSInputStream(storage, uri, gcpProperties, MetricsContext.nullMetrics())) {
+      assertThat(in.read()).isEqualTo(i0);
+      assertThat(in.read()).isEqualTo(i1);
+    }
+  }
+
   private void readAndCheck(
       SeekableInputStream in, long rangeStart, int size, byte[] original, boolean buffered)
       throws IOException {