diff --git a/jadx-core/src/main/java/jadx/core/dex/visitors/RenameVisitor.java b/jadx-core/src/main/java/jadx/core/dex/visitors/RenameVisitor.java
index 4f91ed490..77822451f 100644
--- a/jadx-core/src/main/java/jadx/core/dex/visitors/RenameVisitor.java
+++ b/jadx-core/src/main/java/jadx/core/dex/visitors/RenameVisitor.java
@@ -92,6 +92,9 @@ public class RenameVisitor extends AbstractVisitor {
 		if (firstChar == '$') {
 			return 'C' + NameMapper.removeInvalidCharsMiddle(clsName);
 		}
+		if (!NameMapper.isValidIdentifier(clsName)) {
+			return 'C' + clsName;
+		}
 		return NameMapper.removeInvalidChars(clsName, "C");
 	}
 
diff --git a/jadx-core/src/test/java/jadx/tests/integration/names/TestReservedClassNames.java b/jadx-core/src/test/java/jadx/tests/integration/names/TestReservedClassNames.java
new file mode 100644
index 000000000..b29baa63f
--- /dev/null
+++ b/jadx-core/src/test/java/jadx/tests/integration/names/TestReservedClassNames.java
@@ -0,0 +1,27 @@
+package jadx.tests.integration.names;
+
+import org.junit.Test;
+
+import jadx.core.dex.nodes.ClassNode;
+import jadx.tests.api.SmaliTest;
+
+import static org.hamcrest.Matchers.containsString;
+import static org.hamcrest.Matchers.not;
+import static org.junit.Assert.assertThat;
+
+import java.io.File;
+
+public class TestReservedClassNames extends SmaliTest {
+	/*
+		public class do {
+		}
+	*/
+
+	@Test
+	public void test() {
+		ClassNode cls = getClassNodeFromSmali("names" + File.separatorChar + "TestReservedClassNames", "do");
+		String code = cls.getCode().toString();
+
+		assertThat(code, not(containsString("public class do")));
+	}
+}
diff --git a/jadx-core/src/test/smali/names/TestReservedClassNames.smali b/jadx-core/src/test/smali/names/TestReservedClassNames.smali
new file mode 100644
index 000000000..b5dadcccc
--- /dev/null
+++ b/jadx-core/src/test/smali/names/TestReservedClassNames.smali
@@ -0,0 +1,12 @@
+.class public Ldo;
+.super Ljava/lang/Object;
+
+# direct methods
+.method public constructor <init>()V
+    .locals 0
+
+    .line 3
+    invoke-direct {p0}, Ljava/lang/Object;-><init>()V
+
+    return-void
+.end method