diff --git a/src/java/org/apache/poi/hssf/usermodel/HSSFEvaluationSheet.java b/src/java/org/apache/poi/hssf/usermodel/HSSFEvaluationSheet.java
index 841daa6d33..79d6291d3f 100644
--- a/src/java/org/apache/poi/hssf/usermodel/HSSFEvaluationSheet.java
+++ b/src/java/org/apache/poi/hssf/usermodel/HSSFEvaluationSheet.java
@@ -43,7 +43,7 @@ final class HSSFEvaluationSheet implements EvaluationSheet {
      * @see org.apache.poi.ss.formula.EvaluationSheet#getlastRowNum()
      * @since POI 4.0.0
      */
-    public int getlastRowNum() {
+    public int getLastRowNum() {
         return _lastDefinedRow;
     }
     
diff --git a/src/java/org/apache/poi/ss/formula/EvaluationSheet.java b/src/java/org/apache/poi/ss/formula/EvaluationSheet.java
index e155d0f68f..6c8a5e3351 100644
--- a/src/java/org/apache/poi/ss/formula/EvaluationSheet.java
+++ b/src/java/org/apache/poi/ss/formula/EvaluationSheet.java
@@ -48,5 +48,5 @@ public interface EvaluationSheet {
      * @return last row index referenced on this sheet, for evaluation optimization
      * @since POI 4.0.0
      */
-    public int getlastRowNum();
+    public int getLastRowNum();
 }
diff --git a/src/java/org/apache/poi/ss/formula/FormulaUsedBlankCellSet.java b/src/java/org/apache/poi/ss/formula/FormulaUsedBlankCellSet.java
index 18e88a8be9..0bb94659ee 100644
--- a/src/java/org/apache/poi/ss/formula/FormulaUsedBlankCellSet.java
+++ b/src/java/org/apache/poi/ss/formula/FormulaUsedBlankCellSet.java
@@ -183,7 +183,7 @@ final class FormulaUsedBlankCellSet {
 
 		BlankCellSheetGroup result = _sheetGroupsByBookSheet.get(key);
 		if (result == null) {
-			result = new BlankCellSheetGroup(evalWorkbook.getSheet(sheetIndex).getlastRowNum());
+			result = new BlankCellSheetGroup(evalWorkbook.getSheet(sheetIndex).getLastRowNum());
 			_sheetGroupsByBookSheet.put(key, result);
 		}
 		return result;
diff --git a/src/java/org/apache/poi/ss/formula/eval/forked/ForkedEvaluationSheet.java b/src/java/org/apache/poi/ss/formula/eval/forked/ForkedEvaluationSheet.java
index 698fda5649..9a8f5a49a3 100644
--- a/src/java/org/apache/poi/ss/formula/eval/forked/ForkedEvaluationSheet.java
+++ b/src/java/org/apache/poi/ss/formula/eval/forked/ForkedEvaluationSheet.java
@@ -57,8 +57,8 @@ final class ForkedEvaluationSheet implements EvaluationSheet {
      * @see org.apache.poi.ss.formula.EvaluationSheet#getlastRowNum()
      * @since POI 4.0.0
      */
-    public int getlastRowNum() {
-        return _masterSheet.getlastRowNum();
+    public int getLastRowNum() {
+        return _masterSheet.getLastRowNum();
     }
     
     @Override
diff --git a/src/ooxml/java/org/apache/poi/xssf/streaming/SXSSFEvaluationSheet.java b/src/ooxml/java/org/apache/poi/xssf/streaming/SXSSFEvaluationSheet.java
index ccb685690c..f32f665c8b 100644
--- a/src/ooxml/java/org/apache/poi/xssf/streaming/SXSSFEvaluationSheet.java
+++ b/src/ooxml/java/org/apache/poi/xssf/streaming/SXSSFEvaluationSheet.java
@@ -42,7 +42,7 @@ final class SXSSFEvaluationSheet implements EvaluationSheet {
      * @see org.apache.poi.ss.formula.EvaluationSheet#getlastRowNum()
      * @since POI 4.0.0
      */
-    public int getlastRowNum() {
+    public int getLastRowNum() {
         return _lastDefinedRow;
     }
     
diff --git a/src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFEvaluationSheet.java b/src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFEvaluationSheet.java
index debb6c5dcb..39ef51f37b 100644
--- a/src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFEvaluationSheet.java
+++ b/src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFEvaluationSheet.java
@@ -49,7 +49,7 @@ final class XSSFEvaluationSheet implements EvaluationSheet {
      * @see org.apache.poi.ss.formula.EvaluationSheet#getlastRowNum()
      * @since POI 4.0.0
      */
-    public int getlastRowNum() {
+    public int getLastRowNum() {
         return _lastDefinedRow;
     }