diff --git a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/actions/IndentAction.java b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/actions/IndentAction.java
index 0791cd2f761..e49283c0e25 100644
--- a/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/actions/IndentAction.java
+++ b/core/org.eclipse.cdt.ui/src/org/eclipse/cdt/internal/ui/actions/IndentAction.java
@@ -216,7 +216,7 @@ public class IndentAction extends TextEditorAction {
 				indent= computePreprocessorIndent(document, line, startingPartition);
 			} else if (startingPartition.getType().equals(ICPartitions.C_STRING) && offset > startingPartition.getOffset()) {
 				// don't indent inside (raw-)string
-				indent = ""; //$NON-NLS-1$
+				return false;
 			} else if (!fIsTabAction && startingPartition.getOffset() == offset && startingPartition.getType().equals(ICPartitions.C_SINGLE_LINE_COMMENT)) {
 				// line comment starting at position 0 -> indent inside
 				if (indentInsideLineComments()) {