diff --git a/Systems/libraries.xml b/Systems/libraries.xml
index 605f249d..23215a93 100644
--- a/Systems/libraries.xml
+++ b/Systems/libraries.xml
@@ -203,7 +203,9 @@
 			<expression>
 				<floor>
 					<div>
-						<property>/it-autoflight/internal/vert-speed-fpm</property> 
+						<abs>
+							<property>/it-autoflight/internal/vert-speed-fpm</property> 
+						</abs>
 						<value>100</value>
 					</div>
 				</floor>
diff --git a/revision.txt b/revision.txt
index 371c709c..e6e2a381 100644
--- a/revision.txt
+++ b/revision.txt
@@ -1 +1 @@
-3047
\ No newline at end of file
+3048
\ No newline at end of file