diff --git a/CHANGELOG.md b/CHANGELOG.md
index 21762f89..ed4f44c3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -26,7 +26,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 - Nothing.
 
 ### Fixed
-
+- Correct default fill style for conditional without a pattern defined [Issue #2035](https://github.com/PHPOffice/PhpSpreadsheet/issues/2035) [PR #2050](https://github.com/PHPOffice/PhpSpreadsheet/pull/2050)
 - Fixed issue where array key check for existince before accessing arrays in Xlsx.php. [PR #1970](https://github.com/PHPOffice/PhpSpreadsheet/pull/1970)
 - Fixed issue with quoted strings in number format mask rendered with toFormattedString() [Issue 1972#](https://github.com/PHPOffice/PhpSpreadsheet/issues/1972) [PR #1978](https://github.com/PHPOffice/PhpSpreadsheet/pull/1978)
 - Fixed issue with percentage formats in number format mask rendered with toFormattedString() [Issue 1929#](https://github.com/PHPOffice/PhpSpreadsheet/issues/1929) [PR #1928](https://github.com/PHPOffice/PhpSpreadsheet/pull/1928)
diff --git a/src/PhpSpreadsheet/Reader/Xlsx/Styles.php b/src/PhpSpreadsheet/Reader/Xlsx/Styles.php
index 2b0c7016..2968a3fe 100644
--- a/src/PhpSpreadsheet/Reader/Xlsx/Styles.php
+++ b/src/PhpSpreadsheet/Reader/Xlsx/Styles.php
@@ -103,17 +103,21 @@ class Styles extends BaseParserClass
                 self::readColor(self::getArrayItem($gradientFill->xpath('sml:stop[@position=1]'))->color)
             );
         } elseif ($fillStyleXml->patternFill) {
-            $patternType = (string) $fillStyleXml->patternFill['patternType'] != ''
-                ? (string) $fillStyleXml->patternFill['patternType']
-                : Fill::FILL_NONE;
-
-            $fillStyle->setFillType($patternType);
+            $defaultFillStyle = Fill::FILL_NONE;
             if ($fillStyleXml->patternFill->fgColor) {
                 $fillStyle->getStartColor()->setARGB(self::readColor($fillStyleXml->patternFill->fgColor, true));
+                $defaultFillStyle = Fill::FILL_SOLID;
             }
             if ($fillStyleXml->patternFill->bgColor) {
                 $fillStyle->getEndColor()->setARGB(self::readColor($fillStyleXml->patternFill->bgColor, true));
+                $defaultFillStyle = Fill::FILL_SOLID;
             }
+
+            $patternType = (string) $fillStyleXml->patternFill['patternType'] != ''
+                ? (string) $fillStyleXml->patternFill['patternType']
+                : $defaultFillStyle;
+
+            $fillStyle->setFillType($patternType);
         }
     }
 
diff --git a/src/PhpSpreadsheet/Writer/Xls/Style/ColorMap.php b/src/PhpSpreadsheet/Writer/Xls/Style/ColorMap.php
index e3a6b206..caf85c04 100644
--- a/src/PhpSpreadsheet/Writer/Xls/Style/ColorMap.php
+++ b/src/PhpSpreadsheet/Writer/Xls/Style/ColorMap.php
@@ -75,6 +75,16 @@ class ColorMap
             return self::$colorMap["#{$colorRgb}"];
         }
 
+//      TODO Try and map RGB value to nearest colour within the define pallette
+//        $red =  Color::getRed($colorRgb, false);
+//        $green = Color::getGreen($colorRgb, false);
+//        $blue = Color::getBlue($colorRgb, false);
+
+//        $paletteSpace = 3;
+//        $newColor = ($red * $paletteSpace / 256) * ($paletteSpace * $paletteSpace) +
+//            ($green * $paletteSpace / 256) * $paletteSpace +
+//            ($blue * $paletteSpace / 256);
+
         return $defaultIndex;
     }
 }
diff --git a/tests/PhpSpreadsheetTests/Reader/Xlsx/DefaultFillTest.php b/tests/PhpSpreadsheetTests/Reader/Xlsx/DefaultFillTest.php
index 88d666b2..ccdad067 100644
--- a/tests/PhpSpreadsheetTests/Reader/Xlsx/DefaultFillTest.php
+++ b/tests/PhpSpreadsheetTests/Reader/Xlsx/DefaultFillTest.php
@@ -29,4 +29,15 @@ class DefaultFillTest extends TestCase
         self::assertSame('none', $sheet->getCell('J16')->getStyle()->getFill()->getFillType());
         self::assertSame('solid', $sheet->getCell('C2')->getStyle()->getFill()->getFillType());
     }
+
+    public function testDefaultConditionalFill(): void
+    {
+        // default fill pattern for a conditional style where the filltype is not defined
+        $filename = 'tests/data/Reader/XLSX/pr2050cf-fill.xlsx';
+        $reader = IOFactory::createReader('Xlsx');
+        $spreadsheet = $reader->load($filename);
+
+        $style = $spreadsheet->getActiveSheet()->getConditionalStyles('A1')[0]->getStyle();
+        self::assertSame('solid', $style->getFill()->getFillType());
+    }
 }
diff --git a/tests/data/Reader/XLSX/pr2050cf-fill.xlsx b/tests/data/Reader/XLSX/pr2050cf-fill.xlsx
new file mode 100644
index 00000000..e2183422
Binary files /dev/null and b/tests/data/Reader/XLSX/pr2050cf-fill.xlsx differ