diff --git a/src/main/java/babric/mappings/BabricIntermediaryProvider.java b/src/main/java/babric/mappings/BabricIntermediaryProvider.java
index cf3a700..1cb4a15 100644
--- a/src/main/java/babric/mappings/BabricIntermediaryProvider.java
+++ b/src/main/java/babric/mappings/BabricIntermediaryProvider.java
@@ -10,6 +10,8 @@
 import org.gradle.api.Project;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
 import java.nio.file.Files;
@@ -18,6 +20,8 @@
 import java.util.Map;
 
 public abstract class BabricIntermediaryProvider extends IntermediaryMappingsProvider {
+    private static final Logger LOGGER = LoggerFactory.getLogger(BabricIntermediaryProvider.class);
+
     @Override
     public @NotNull String getName() {
         return "babric-" + super.getName();
@@ -25,6 +29,17 @@ public abstract class BabricIntermediaryProvider extends IntermediaryMappingsPro
 
     @Override
     public void provide(Path tinyMappings, @Nullable Project project) throws IOException {
+        if (Files.exists(tinyMappings)) {
+            MemoryMappingTree mappingTree = new MemoryMappingTree();
+
+            MappingReader.read(tinyMappings, mappingTree);
+
+            if (mappingTree.getDstNamespaces().contains("glue")) {
+                LOGGER.warn("Found old intermediary format, it will be replaced.\nYou might need to run gradle with --refresh-dependencies to make sure mappings and jars are updated too.");
+                Files.delete(tinyMappings);
+            }
+        }
+
         if (!Files.exists(tinyMappings) || this.getRefreshDeps().get()) {
             Path intermediaryTempPath = tinyMappings.getParent().resolve(this.getName() + "-temp.tiny");
             super.provide(intermediaryTempPath, project);