diff --git a/unilabos_msgs/action/LiquidHandlerTransferBiomek.action b/unilabos_msgs/action/LiquidHandlerTransferBiomek.action
index 02beef64..b52dec57 100644
--- a/unilabos_msgs/action/LiquidHandlerTransferBiomek.action
+++ b/unilabos_msgs/action/LiquidHandlerTransferBiomek.action
@@ -1,7 +1,7 @@
 string source
 string target
 string tip_rack
-float volume
+float64 volume
 string aspirate_technique
 string dispense_technique