diff --git a/src/java/org/apache/poi/hssf/model/FormulaParser.java b/src/java/org/apache/poi/hssf/model/FormulaParser.java
index 78a94bff4..2141b53ed 100644
--- a/src/java/org/apache/poi/hssf/model/FormulaParser.java
+++ b/src/java/org/apache/poi/hssf/model/FormulaParser.java
@@ -115,7 +115,7 @@ public class FormulaParser {
     private void Abort(String s) {
         Error(s);
         //System.exit(1);  //throw exception??
-        throw new RuntimeException("Cannot Parse, sorry : "+s);
+        throw new RuntimeException("Cannot Parse, sorry : "+s + " [Formula String was: '"+formulaString+"']");
     }
     
     
@@ -466,6 +466,11 @@ public class FormulaParser {
     		Factor();
     		tokens.add(new UnaryMinusPtg());
     	}
+        else if (look == '+') {
+            Match('+');
+            Factor();
+            tokens.add(new UnaryPlusPtg());
+        }
         else if (look == '(' ) {
             Match('(');
             Expression();
diff --git a/src/testcases/org/apache/poi/hssf/model/TestFormulaParser.java b/src/testcases/org/apache/poi/hssf/model/TestFormulaParser.java
index ec840ba3b..1e69ce0ed 100644
--- a/src/testcases/org/apache/poi/hssf/model/TestFormulaParser.java
+++ b/src/testcases/org/apache/poi/hssf/model/TestFormulaParser.java
@@ -36,6 +36,7 @@ import org.apache.poi.hssf.record.formula.Ptg;
 import org.apache.poi.hssf.record.formula.ReferencePtg;
 import org.apache.poi.hssf.record.formula.StringPtg;
 import org.apache.poi.hssf.record.formula.UnaryMinusPtg;
+import org.apache.poi.hssf.record.formula.UnaryPlusPtg;
 import org.apache.poi.hssf.usermodel.HSSFCell;
 import org.apache.poi.hssf.usermodel.HSSFRow;
 import org.apache.poi.hssf.usermodel.HSSFSheet;
@@ -323,7 +324,17 @@ public class TestFormulaParser extends TestCase {
 		Ptg[] ptg = fp.getRPNPtg();
 		assertTrue("got 2 ptgs", ptg.length == 2);
 		assertTrue("first ptg is reference",ptg[0] instanceof ReferencePtg);
-		assertTrue("second ptg is string",ptg[1] instanceof UnaryMinusPtg);
+		assertTrue("second ptg is Minus",ptg[1] instanceof UnaryMinusPtg);
+     }
+    
+    public void testUnaryPlus()
+    {
+		FormulaParser fp = new FormulaParser("+A1", null);
+		fp.parse();
+		Ptg[] ptg = fp.getRPNPtg();
+		assertTrue("got 2 ptgs", ptg.length == 2);
+		assertTrue("first ptg is reference",ptg[0] instanceof ReferencePtg);
+		assertTrue("second ptg is Plus",ptg[1] instanceof UnaryPlusPtg);
      }
     
 	public void testLeadingSpaceInString()