diff --git a/src/main/java/com/sk89q/worldedit/EditSession.java b/src/main/java/com/sk89q/worldedit/EditSession.java
index 401edd3c1..6192e3b74 100644
--- a/src/main/java/com/sk89q/worldedit/EditSession.java
+++ b/src/main/java/com/sk89q/worldedit/EditSession.java
@@ -1275,17 +1275,9 @@ public class EditSession {
                     for (int z = minZ; z <= maxZ; ++z) {
                         Vector pt = new Vector(x, y, z);
                         BaseBlock curBlockType = getBlock(pt);
-
-                        if (definiteBlockTypes == null) {
-                            //replace <to-block>
-                            if (curBlockType.isAir()) {
-                                continue;
-                            }
-                        } else {
-                            //replace <from-block> <to-block>
-                            if (!definiteBlockTypes.contains(curBlockType) && fuzzyBlockTypes.contains(curBlockType.getType())) {
-                                continue;
-                            }
+                        //replace <from-block> <to-block>
+                        if (!definiteBlockTypes.contains(curBlockType) && !fuzzyBlockTypes.contains(curBlockType.getType())) {
+                            continue;
                         }
 
                         if (setBlock(pt, toBlock)) {
@@ -1298,16 +1290,9 @@ public class EditSession {
             for (Vector pt : region) {
                 BaseBlock curBlockType = getBlock(pt);
 
-                if (definiteBlockTypes == null) {
-                    //replace <to-block>
-                    if (curBlockType.isAir()) {
-                        continue;
-                    }
-                } else {
-                    //replace <from-block> <to-block>
-                    if (!definiteBlockTypes.contains(curBlockType) && fuzzyBlockTypes.contains(curBlockType.getType())) {
-                        continue;
-                    }
+                //replace <from-block> <to-block>
+                if (!definiteBlockTypes.contains(curBlockType) && !fuzzyBlockTypes.contains(curBlockType.getType())) {
+                    continue;
                 }
 
                 if (setBlock(pt, toBlock)) {