diff --git a/src/java/org/lwjgl/opengl/XRandR.java b/src/java/org/lwjgl/opengl/XRandR.java
index 8e59bb64a..2fa81d6fe 100644
--- a/src/java/org/lwjgl/opengl/XRandR.java
+++ b/src/java/org/lwjgl/opengl/XRandR.java
@@ -262,7 +262,7 @@ public static Screen[] getResolutions(String name) {
 	}
 
 	private static final Pattern SCREEN_HEADER_PATTERN   = Pattern.compile("^(\\d+)x(\\d+)[+](\\d+)[+](\\d+)$");
-	private static final Pattern SCREEN_MODELINE_PATTERN = Pattern.compile("^(\\d+)x(\\d+)$");
+	private static final Pattern SCREEN_MODELINE_PATTERN = Pattern.compile("^(\d+)x(\d+)(_\d+\.\d+)?$");
 	private static final Pattern FREQ_PATTERN            = Pattern.compile("^(\\d+[.]\\d+)(?:\\s*[*])?(?:\\s*[+])?$");
 
 	/**
@@ -398,4 +398,4 @@ public String toString() {
 			return name + " " + width + "x" + height + " @ " + xPos + "x" + yPos + " with " + freqOriginal + "Hz";
 		}
 	}
-}
\ No newline at end of file
+}