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 232ef19f..73f1b6dc 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
@@ -111,7 +111,7 @@ public class GT_MetaTileEntity_LargeTurbine_Gas extends GT_MetaTileEntity_LargeT
 
             if (totalFlow != actualOptimalFlow) {
                 float efficiency = 1.0f - Math.abs(((totalFlow - (float) actualOptimalFlow) / actualOptimalFlow));
-                if(totalFlow>aOptFlow){efficiency = 1.0f;}
+                if(totalFlow>actualOptimalFlow){efficiency = 1.0f;}
                 if (efficiency < 0)
                     efficiency = 0; // Can happen with really ludicrously poor inefficiency.
                 tEU *= efficiency;
diff --git a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_Plasma.java b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_Plasma.java
index d45c5a82..0fa83be8 100644
--- a/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_Plasma.java
+++ b/src/main/java/gregtech/common/tileentities/machines/multi/GT_MetaTileEntity_LargeTurbine_Plasma.java
@@ -125,7 +125,7 @@ public class GT_MetaTileEntity_LargeTurbine_Plasma extends GT_MetaTileEntity_Lar
 
             if (totalFlow != actualOptimalFlow) {
                 float efficiency = 1.0f - Math.abs(((totalFlow - (float) actualOptimalFlow) / actualOptimalFlow));
-                if(totalFlow>aOptFlow){efficiency = 1.0f;}
+                if(totalFlow>actualOptimalFlow){efficiency = 1.0f;}
                 if (efficiency < 0)
                     efficiency = 0; // Can happen with really ludicrously poor inefficiency.
                 tEU *= efficiency;