diff --git a/src/main/java/net/fabricmc/mappingio/format/MappingFormat.java b/src/main/java/net/fabricmc/mappingio/format/MappingFormat.java
index a12a18fb..ac7bfcf6 100644
--- a/src/main/java/net/fabricmc/mappingio/format/MappingFormat.java
+++ b/src/main/java/net/fabricmc/mappingio/format/MappingFormat.java
@@ -19,7 +19,7 @@
 public enum MappingFormat {
 	TINY_FILE("Tiny file", "tiny", true, true, false, false, false),
 	TINY_2_FILE("Tiny v2 file", "tiny", true, true, true, true, true),
-	ENIGMA_FILE("Enigma file", "mapping", false, true, true, true, false),
+	ENIGMA_FILE("Enigma file", "mappings", false, true, true, true, false),
 	ENIGMA_DIR("Enigma directory", null, false, true, true, true, false),
 	MCP_DIR("MCP directory", null, false, false, true, true, false),
 	SRG_FILE("SRG file", "srg", false, false, false, false, false),
diff --git a/src/main/java/net/fabricmc/mappingio/format/enigma/EnigmaDirReader.java b/src/main/java/net/fabricmc/mappingio/format/enigma/EnigmaDirReader.java
index ae3b8104..637397ed 100644
--- a/src/main/java/net/fabricmc/mappingio/format/enigma/EnigmaDirReader.java
+++ b/src/main/java/net/fabricmc/mappingio/format/enigma/EnigmaDirReader.java
@@ -25,7 +25,6 @@
 
 import net.fabricmc.mappingio.MappingUtil;
 import net.fabricmc.mappingio.MappingVisitor;
-import net.fabricmc.mappingio.format.MappingFormat;
 
 public final class EnigmaDirReader {
 	public static void read(Path dir, MappingVisitor visitor) throws IOException {
@@ -36,7 +35,7 @@ public static void read(Path dir, String sourceNs, String targetNs, MappingVisit
 		Files.walkFileTree(dir, new SimpleFileVisitor<Path>() {
 			@Override
 			public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
-				if (file.getFileName().toString().endsWith("." + MappingFormat.ENIGMA_FILE.fileExt)) {
+				if (file.getFileName().toString().endsWith("." + DIR_FILE_EXT)) {
 					EnigmaFileReader.read(Files.newBufferedReader(file), sourceNs, targetNs, visitor);
 				}
 
@@ -45,4 +44,6 @@ public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IO
 		});
 		visitor.visitEnd();
 	}
+
+	static final String DIR_FILE_EXT = "mapping"; // non-plural form unlike ENIGMA_FILE
 }
diff --git a/src/main/java/net/fabricmc/mappingio/format/enigma/EnigmaDirWriter.java b/src/main/java/net/fabricmc/mappingio/format/enigma/EnigmaDirWriter.java
index 519c666a..ea5332e1 100644
--- a/src/main/java/net/fabricmc/mappingio/format/enigma/EnigmaDirWriter.java
+++ b/src/main/java/net/fabricmc/mappingio/format/enigma/EnigmaDirWriter.java
@@ -29,7 +29,6 @@
 import java.util.List;
 
 import net.fabricmc.mappingio.MappedElementKind;
-import net.fabricmc.mappingio.format.MappingFormat;
 
 public final class EnigmaDirWriter extends EnigmaWriterBase {
 	public EnigmaDirWriter(Path dir, boolean deleteExistingFiles) throws IOException {
@@ -40,7 +39,7 @@ public EnigmaDirWriter(Path dir, boolean deleteExistingFiles) throws IOException
 			Files.walkFileTree(dir, new SimpleFileVisitor<Path>() {
 				@Override
 				public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
-					if (file.getFileName().toString().endsWith("." + MappingFormat.ENIGMA_FILE.fileExt)) {
+					if (file.getFileName().toString().endsWith("." + EnigmaDirReader.DIR_FILE_EXT)) {
 						Files.delete(file);
 					}
 
@@ -82,7 +81,7 @@ public boolean visitElementContent(MappedElementKind targetKind) throws IOExcept
 				if (pos >= 0) name = name.substring(0, pos);
 
 				// currentClass is not an outer class of srcName (or the same)
-				Path file = dir.resolve(name + "." + MappingFormat.ENIGMA_FILE.fileExt).normalize();
+				Path file = dir.resolve(name + "." + EnigmaDirReader.DIR_FILE_EXT).normalize();
 				if (!file.startsWith(dir)) throw new RuntimeException("invalid name: " + name);
 
 				if (writer != null) {