diff --git a/deob-ast/src/main/java/dev/openrs2/deob/ast/transform/CharLiteralTransformer.kt b/deob-ast/src/main/java/dev/openrs2/deob/ast/transform/CharLiteralTransformer.kt
index 909fdaf2..b1dd6fa8 100644
--- a/deob-ast/src/main/java/dev/openrs2/deob/ast/transform/CharLiteralTransformer.kt
+++ b/deob-ast/src/main/java/dev/openrs2/deob/ast/transform/CharLiteralTransformer.kt
@@ -25,7 +25,9 @@ import java.lang.Character.PARAGRAPH_SEPARATOR
 import java.lang.Character.PRIVATE_USE
 import java.lang.Character.SURROGATE
 import java.lang.Character.UNASSIGNED
+import javax.inject.Singleton
 
+@Singleton
 class CharLiteralTransformer : Transformer() {
     override fun transformUnit(group: LibraryGroup, library: Library, unit: CompilationUnit) {
         unit.walk { expr: BinaryExpr ->
diff --git a/deob-ast/src/main/java/dev/openrs2/deob/ast/transform/HexLiteralTransformer.kt b/deob-ast/src/main/java/dev/openrs2/deob/ast/transform/HexLiteralTransformer.kt
index a9e5a88d..868ccd1c 100644
--- a/deob-ast/src/main/java/dev/openrs2/deob/ast/transform/HexLiteralTransformer.kt
+++ b/deob-ast/src/main/java/dev/openrs2/deob/ast/transform/HexLiteralTransformer.kt
@@ -11,7 +11,9 @@ import dev.openrs2.deob.ast.util.checkedAsInt
 import dev.openrs2.deob.ast.util.checkedAsLong
 import dev.openrs2.deob.ast.util.toHexLiteralExpr
 import dev.openrs2.deob.ast.util.walk
+import javax.inject.Singleton
 
+@Singleton
 class HexLiteralTransformer : Transformer() {
     override fun transformUnit(group: LibraryGroup, library: Library, unit: CompilationUnit) {
         unit.walk { expr: BinaryExpr ->
diff --git a/deob-ast/src/main/java/dev/openrs2/deob/ast/transform/RedundantCastTransformer.kt b/deob-ast/src/main/java/dev/openrs2/deob/ast/transform/RedundantCastTransformer.kt
index e112f35b..19b576a9 100644
--- a/deob-ast/src/main/java/dev/openrs2/deob/ast/transform/RedundantCastTransformer.kt
+++ b/deob-ast/src/main/java/dev/openrs2/deob/ast/transform/RedundantCastTransformer.kt
@@ -13,7 +13,9 @@ import com.github.javaparser.resolution.declarations.ResolvedMethodLikeDeclarati
 import dev.openrs2.deob.ast.Library
 import dev.openrs2.deob.ast.LibraryGroup
 import dev.openrs2.deob.ast.util.walk
+import javax.inject.Singleton
 
+@Singleton
 class RedundantCastTransformer : Transformer() {
     override fun transformUnit(group: LibraryGroup, library: Library, unit: CompilationUnit) {
         // remove double casts
diff --git a/deob/src/main/java/dev/openrs2/deob/transform/FinalFieldTransformer.kt b/deob/src/main/java/dev/openrs2/deob/transform/FinalFieldTransformer.kt
index dd901c06..20b5249f 100644
--- a/deob/src/main/java/dev/openrs2/deob/transform/FinalFieldTransformer.kt
+++ b/deob/src/main/java/dev/openrs2/deob/transform/FinalFieldTransformer.kt
@@ -17,7 +17,9 @@ import org.objectweb.asm.tree.FieldInsnNode
 import org.objectweb.asm.tree.MethodInsnNode
 import org.objectweb.asm.tree.MethodNode
 import org.objectweb.asm.tree.analysis.Analyzer
+import javax.inject.Singleton
 
+@Singleton
 class FinalFieldTransformer : Transformer() {
     private lateinit var inheritedFieldSets: DisjointSet<MemberRef>
     private val nonFinalFields = mutableSetOf<DisjointSet.Partition<MemberRef>>()