diff --git a/README.md b/README.md
index b4bad0b..02db1ed 100644
--- a/README.md
+++ b/README.md
@@ -92,6 +92,10 @@ for the [Maps](https://github.com/JeroenDeDauw/Maps) and
 
 ## Release notes
 
+### 3.0.1 (2018-08-01)
+
+* Fixed parsing of coordinates with lowercase S/W directions
+
 ### 3.0.0 (2018-03-20)
 
 * Removed `DATAVALUES_GEO_VERSION` constant
diff --git a/src/Parsers/LatLongParserBase.php b/src/Parsers/LatLongParserBase.php
index 89255a9..92f742d 100644
--- a/src/Parsers/LatLongParserBase.php
+++ b/src/Parsers/LatLongParserBase.php
@@ -225,7 +225,7 @@ protected function resolveDirection( $coordinateSegment ) {
 				$matches
 			);
 
-			if ( $matches[1] === $direction || $matches[3] === $direction ) {
+			if ( $matches[1] !== '' || $matches[3] !== '' ) {
 				$coordinateSegment = $matches[2];
 
 				if ( in_array( $direction, [ $s, $w ] ) ) {
diff --git a/tests/unit/Parsers/LatLongParserTest.php b/tests/unit/Parsers/LatLongParserTest.php
index e3f1743..814efc2 100644
--- a/tests/unit/Parsers/LatLongParserTest.php
+++ b/tests/unit/Parsers/LatLongParserTest.php
@@ -91,6 +91,14 @@ public function validInputProvider() {
 			'0° 0.3\' S 0° 0.3\' W' => [ -0.005, -0.005 ],
 			'-55° 30′ -37° 30′' => [ -55.5, -37.5 ],
 			'S 0° 0.3\' W 0° 0.3\'' => [ -0.005, -0.005 ],
+
+			// case insensitive
+			'55 s, 37.6176330 w' => [ -55, -37.6176330 ],
+			'5.5s,37w ' => [ -5.5, -37 ],
+			'5.5s 37w ' => [ -5.5, -37 ],
+			's5.5 w37 ' => [ -5.5, -37 ],
+			'5.5S 37w ' => [ -5.5, -37 ],
+			'5.5s 37W ' => [ -5.5, -37 ],
 		];
 
 		foreach ( $valid as $value => $expected ) {