diff --git a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/CompleteParseASTTest.java b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/CompleteParseASTTest.java
index e24d13be73a..5194cf69daa 100644
--- a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/CompleteParseASTTest.java
+++ b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/CompleteParseASTTest.java
@@ -2532,5 +2532,17 @@ public class CompleteParseASTTest extends CompleteParseBaseTest
     	writer.write("if (WIFEXITED(test)) {}\n}\n"); //$NON-NLS-1$
     	parse(writer.toString());
     }
+    
+    public void testBug79921_79227() throws Exception {
+    	Writer writer = new StringWriter();
+    	writer.write("/* some\n* commented\n* code\n*/\n"); //$NON-NLS-1$
+    	writer.write("#define g_message(...) g_log (1, 2, __VA_ARGS__);\n"); //$NON-NLS-1$
+    	writer.write("int g_log (int a, int b, ...) { return 0; }\n"); //$NON-NLS-1$
+    	writer.write("int foo2() {\n"); //$NON-NLS-1$
+    	writer.write("g_message(\"a string [as] f%2.2x (%2)\")               \\\n"); //$NON-NLS-1$
+    	writer.write("//    	                                       ^ the culprit\n}\n"); //$NON-NLS-1$
+    	parse(writer.toString());
+    }
+
 }
 
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/scanner2/Scanner2.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/scanner2/Scanner2.java
index a9976e54536..0b522985725 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/scanner2/Scanner2.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/parser/scanner2/Scanner2.java
@@ -2612,6 +2612,7 @@ public class Scanner2 implements IScanner, IScannerData {
 		int currarg = -1;
 		CharArrayObjectMap argmap = new CharArrayObjectMap(arglist.length);
 		
+		boolean insideString = false;
 		while (bufferPos[bufferStackPos] < limit) {
 			skipOverWhiteSpace();
 			
@@ -2632,13 +2633,22 @@ public class Scanner2 implements IScanner, IScannerData {
 			
 		    int argend = -1;
 		    if ((macro.hasGCCVarArgs() || macro.hasVarArgs()) && currarg == macro.getVarArgsPosition()) {
+		    	--bufferPos[bufferStackPos]; // go back to first char of macro args
+		    	
 		    	// there are varargs and the other parms have been accounted for, the rest will replace __VA_ARGS__ or name where "name..." is the parm
-		    	while (++bufferPos[bufferStackPos] < limit) {
-		    		if (buffer[bufferPos[bufferStackPos]] == ')') {
+		    	do {
+		    		if (buffer[bufferPos[bufferStackPos]] == '"') {
+		    			if (insideString) 
+		    				insideString = false; 
+		    			else 
+		    				insideString = true;
+		    		}
+		    		
+		    		if (!insideString && buffer[bufferPos[bufferStackPos]] == ')') {
 		    			--bufferPos[bufferStackPos];
 		    			break;
 		    		}
-		    	}
+		    	} while (++bufferPos[bufferStackPos] < limit);
 		    	argend = bufferPos[bufferStackPos];
 		    } else
 		    	argend = skipOverMacroArg();