diff --git a/CHANGELOG.md b/CHANGELOG.md
index d9ab7b90..5c4a1a8b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## [Unreleased]
 * Added support for live-syncing `CollectionService` tags.
 * Added a warning when building binary place files, since they're still experimental and have bugs.
+* Added a warning when trying to use Rojo 0.5.x with a Rojo 0.4.x-only project.
 * Fixed plugin live-sync not ignoring unknown properties.
 
 ## [0.5.0 Alpha 11](https://github.com/LPGhatguy/rojo/releases/tag/v0.5.0-alpha.11) (May 29, 2019)
diff --git a/server/src/project.rs b/server/src/project.rs
index 346158ee..5d190d0b 100644
--- a/server/src/project.rs
+++ b/server/src/project.rs
@@ -439,8 +439,13 @@ impl Project {
     }
 
     pub fn load_fuzzy(fuzzy_project_location: &Path) -> Result<Project, ProjectLoadFuzzyError> {
-        let project_path = Self::locate(fuzzy_project_location)
-            .ok_or(ProjectLoadFuzzyError::NotFound)?;
+        let project_path = match Self::locate(fuzzy_project_location) {
+            Some(path) => path,
+            None => {
+                Project::warn_if_4x_project_present(fuzzy_project_location);
+                return Err(ProjectLoadFuzzyError::NotFound);
+            }
+        };
 
         Self::load_exact(&project_path).map_err(From::from)
     }
@@ -485,6 +490,21 @@ impl Project {
         }
     }
 
+    /// Issues a warning if no Rojo 0.5.x project is found, but there's a legacy
+    /// 0.4.x project in the directory.
+    fn warn_if_4x_project_present(folder: &Path) {
+        let file_path = folder.join("rojo.json");
+
+        if fs::metadata(file_path).is_ok() {
+            warn!("No Rojo 0.5 project file was found, but a Rojo 0.4 project was.");
+            warn!("Rojo 0.5.x uses 'default.project.json' files");
+            warn!("Rojo 0.5.x uses 'rojo.json' files");
+            warn!("");
+            warn!("For help upgrading, see:");
+            warn!("https://lpghatguy.github.io/rojo/guide/migrating-to-epiphany/");
+        }
+    }
+
     pub fn folder_location(&self) -> &Path {
         self.file_location.parent().unwrap()
     }
diff --git a/test-projects/legacy/rojo.json b/test-projects/legacy/rojo.json
new file mode 100644
index 00000000..547d3943
--- /dev/null
+++ b/test-projects/legacy/rojo.json
@@ -0,0 +1,4 @@
+{
+  "name": "legacy",
+  "parittions": {}
+}
\ No newline at end of file