diff --git a/poi/src/main/java/org/apache/poi/ss/formula/functions/DStarRunner.java b/poi/src/main/java/org/apache/poi/ss/formula/functions/DStarRunner.java
index 295721b4d..21aa9ed32 100644
--- a/poi/src/main/java/org/apache/poi/ss/formula/functions/DStarRunner.java
+++ b/poi/src/main/java/org/apache/poi/ss/formula/functions/DStarRunner.java
@@ -316,7 +316,7 @@ public final class DStarRunner implements Function3Arg {
                     return testNumericCondition(value, operator.equal, stringOrNumber);
                 } else { // It's a string.
                     String valueString = value instanceof BlankEval ? "" : OperandResolver.coerceValueToString(value);
-                    return stringOrNumber.equals(valueString);
+                    return stringOrNumber.equalsIgnoreCase(valueString);
                 }
             } else { // It's a text starts-with condition.
                 if(conditionString.isEmpty()) {
@@ -324,7 +324,8 @@ public final class DStarRunner implements Function3Arg {
                 }
                 else {
                     String valueString = value instanceof BlankEval ? "" : OperandResolver.coerceValueToString(value);
-                    return valueString.startsWith(conditionString);
+                    return valueString.toUpperCase().toLowerCase()
+                            .startsWith(conditionString.toUpperCase().toLowerCase());
                 }
             }
         } else if(condition instanceof NumericValueEval) {