diff --git a/Cargo.toml b/Cargo.toml
index 61b24ad8604..338b352e548 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -43,7 +43,7 @@ os_pipe = "0.9"
 stderrlog = "0.4"
 structopt = { version = "0.3", features = ["wrap_help"] }
 tempfile = "3"
-tree_magic = "0.2"
+tree_magic_mini = "3.0.2"
 wayland-client = "0.27"
 
 [dependencies.wayland-protocols]
diff --git a/src/copy.rs b/src/copy.rs
index 5a2c0b47813..dca9f7a21a9 100644
--- a/src/copy.rs
+++ b/src/copy.rs
@@ -461,7 +461,14 @@ fn make_source(source: Source,
     }
 
     let mime_type = match mime_type {
-        MimeType::Autodetect => tree_magic::from_filepath(&temp_filename),
+        MimeType::Autodetect => match tree_magic_mini::from_filepath(&temp_filename) {
+            Some(magic) => Ok(magic),
+            None => Err(SourceCreationError::TempFileOpen(std::io::Error::new(
+                std::io::ErrorKind::Other,
+                "problem with temp file",
+            ))),
+        }?
+        .to_string(),
         MimeType::Text => "text/plain".to_string(),
         MimeType::Specific(mime_type) => mime_type,
     };