diff --git a/src/main/java/net/patchworkmc/manifest/accesstransformer/AccessTransformerEntry.java b/src/main/java/net/patchworkmc/manifest/accesstransformer/AccessTransformerEntry.java
index 486bfd2..76c49ba 100644
--- a/src/main/java/net/patchworkmc/manifest/accesstransformer/AccessTransformerEntry.java
+++ b/src/main/java/net/patchworkmc/manifest/accesstransformer/AccessTransformerEntry.java
@@ -3,7 +3,7 @@
 import java.util.Objects;
 
 import net.patchworkmc.manifest.accesstransformer.v2.ForgeAccessTransformer;
-import net.patchworkmc.manifest.accesstransformer.v2.exception.FatalRemappingException;
+import net.patchworkmc.manifest.accesstransformer.v2.exception.FatalMissingMappingException;
 import net.patchworkmc.manifest.accesstransformer.v2.exception.MissingMappingException;
 import net.patchworkmc.manifest.api.Remapper;
 
@@ -46,7 +46,7 @@ public AccessTransformerEntry remap(Remapper remapper) {
 			this.memberName = mappedMemberName;
 			return this;
 		} catch (MissingMappingException ex) {
-			throw new FatalRemappingException(ex);
+			throw new FatalMissingMappingException(ex);
 		}
 	}
 
diff --git a/src/main/java/net/patchworkmc/manifest/accesstransformer/v2/exception/FatalMissingMappingException.java b/src/main/java/net/patchworkmc/manifest/accesstransformer/v2/exception/FatalMissingMappingException.java
new file mode 100644
index 0000000..23faa1b
--- /dev/null
+++ b/src/main/java/net/patchworkmc/manifest/accesstransformer/v2/exception/FatalMissingMappingException.java
@@ -0,0 +1,25 @@
+package net.patchworkmc.manifest.accesstransformer.v2.exception;
+
+public class FatalMissingMappingException extends RuntimeException {
+	public FatalMissingMappingException(String message, MissingMappingException parent) {
+		super(message, parent);
+	}
+
+	public FatalMissingMappingException(MissingMappingException parent) {
+		super(parent);
+	}
+
+	@Override
+	public synchronized MissingMappingException getCause() {
+		return (MissingMappingException) super.getCause();
+	}
+
+	@Override
+	public synchronized Throwable initCause(Throwable cause) {
+		if (!(cause instanceof MissingMappingException)) {
+			throw new IllegalArgumentException("Cause must be an instance of MissingMappingException!");
+		}
+
+		return super.initCause(cause);
+	}
+}
diff --git a/src/main/java/net/patchworkmc/manifest/accesstransformer/v2/exception/FatalRemappingException.java b/src/main/java/net/patchworkmc/manifest/accesstransformer/v2/exception/FatalRemappingException.java
deleted file mode 100644
index e395951..0000000
--- a/src/main/java/net/patchworkmc/manifest/accesstransformer/v2/exception/FatalRemappingException.java
+++ /dev/null
@@ -1,11 +0,0 @@
-package net.patchworkmc.manifest.accesstransformer.v2.exception;
-
-public class FatalRemappingException extends RuntimeException {
-	public FatalRemappingException(String message, Exception parent) {
-		super(message, parent);
-	}
-
-	public FatalRemappingException(Exception parent) {
-		super(parent);
-	}
-}