diff --git a/src/wp-includes/default-constants.php b/src/wp-includes/default-constants.php
index 34750057be..bc6c79a80b 100644
--- a/src/wp-includes/default-constants.php
+++ b/src/wp-includes/default-constants.php
@@ -44,8 +44,11 @@ function wp_initial_constants() {
 		$current_limit_int = intval( $current_limit );
 		if ( false !== stripos( $current_limit, 'G' ) )
 			$current_limit_int *= 1024;
+		$wp_limit_int = intval( WP_MEMORY_LIMIT );
+		if ( false !== stripos( WP_MEMORY_LIMIT, 'G' ) )
+			$wp_limit_int *= 1024;
 
-		if ( -1 != $current_limit && ( -1 == WP_MEMORY_LIMIT || ( $current_limit_int < abs( intval( WP_MEMORY_LIMIT ) ) ) ) )
+		if ( -1 != $current_limit && ( -1 == WP_MEMORY_LIMIT || $current_limit_int < $wp_limit_int ) )
 			@ini_set( 'memory_limit', WP_MEMORY_LIMIT );
 	}