diff --git a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_Gas.java b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_Gas.java
index 90dc8b37..963a4efc 100644
--- a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_Gas.java
+++ b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_Gas.java
@@ -114,9 +114,9 @@ public class GT_MetaTileEntity_LargeTurbine_Gas extends GT_MetaTileEntity_LargeT
                 if (efficiency < 0)
                     efficiency = 0; // Can happen with really ludicrously poor inefficiency.
                 tEU *= efficiency;
-                tEU = Math.max(1, tEU * (aBaseEff / 10000));
+                tEU = Math.max(1, (int)((long)tEU * (long)aBaseEff / 10000L));
             } else {
-                tEU = tEU * (aBaseEff / 10000);
+                tEU = (int)((long)tEU * (long)aBaseEff / 10000L);
             }
 
             return tEU;