diff --git a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/scanner/PreprocessorBugsTests.java b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/scanner/PreprocessorBugsTests.java
index bf6fca6bf61..16fdff1d319 100644
--- a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/scanner/PreprocessorBugsTests.java
+++ b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/scanner/PreprocessorBugsTests.java
@@ -308,4 +308,23 @@ public class PreprocessorBugsTests extends PreprocessorTestsBase {
 		validateString("unsignedint f();");
 		validateEOF();
 	}
+	
+	// #if '\0'
+	// no
+	// #else
+	// yes
+	// #endif
+	// #if '\1'
+	// yes
+	// #else
+	// no
+	// #endif
+	public void testOcatalCharConstant_Bug330747() throws Exception {
+		initializeScanner();
+		validateIdentifier("yes");
+		validateIdentifier("yes");
+		validateEOF();
+		validateProblemCount(0);
+	}
+
 }
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/scanner/ExpressionEvaluator.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/scanner/ExpressionEvaluator.java
index f031cc3fed0..fba757060a2 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/scanner/ExpressionEvaluator.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/scanner/ExpressionEvaluator.java
@@ -408,7 +408,7 @@ public class ExpressionEvaluator {
 		case 'v': return 0xb;
 		
 		case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7':
-			return getNumber(tokenImage, i+1, tokenImage.length-1, 8, IProblem.SCANNER_BAD_OCTAL_FORMAT);
+			return getNumber(tokenImage, i, tokenImage.length-1, 8, IProblem.SCANNER_BAD_OCTAL_FORMAT);
 		
 		case 'x': case 'u': case 'U':
 			return getNumber(tokenImage, i+1, tokenImage.length-1, 16, IProblem.SCANNER_BAD_HEX_FORMAT);