diff --git a/modules/openapi-generator/src/main/resources/rust-server/generate-multipart-related.mustache b/modules/openapi-generator/src/main/resources/rust-server/generate-multipart-related.mustache
index ff2330c07d4d..352273790bff 100644
--- a/modules/openapi-generator/src/main/resources/rust-server/generate-multipart-related.mustache
+++ b/modules/openapi-generator/src/main/resources/rust-server/generate-multipart-related.mustache
@@ -39,7 +39,10 @@
 {{#-last}}
 
         // Write the body into a vec.
-        let mut body: Vec<u8> = vec![];
+        // RFC 13341 Section 7.2.1 suggests that the body should begin with a
+        // CRLF prior to the first boundary. The mime_multipart library doesn't
+        // do this, so we do it instead.
+        let mut body: Vec<u8> = vec![b'\r', b'\n'];
         write_multipart(&mut body, &boundary, &body_parts)
             .expect("Failed to write multipart body");
 {{/-last}}
diff --git a/samples/server/petstore/rust-server/output/multipart-v3/src/client/mod.rs b/samples/server/petstore/rust-server/output/multipart-v3/src/client/mod.rs
index 2d52eec0a593..4e4f13bccd91 100644
--- a/samples/server/petstore/rust-server/output/multipart-v3/src/client/mod.rs
+++ b/samples/server/petstore/rust-server/output/multipart-v3/src/client/mod.rs
@@ -478,7 +478,10 @@ impl<S, C> Api<C> for Client<S, C> where
         }
 
         // Write the body into a vec.
-        let mut body: Vec<u8> = vec![];
+        // RFC 13341 Section 7.2.1 suggests that the body should begin with a
+        // CRLF prior to the first boundary. The mime_multipart library doesn't
+        // do this, so we do it instead.
+        let mut body: Vec<u8> = vec![b'\r', b'\n'];
         write_multipart(&mut body, &boundary, &body_parts)
             .expect("Failed to write multipart body");
 
@@ -759,7 +762,10 @@ impl<S, C> Api<C> for Client<S, C> where
         }
 
         // Write the body into a vec.
-        let mut body: Vec<u8> = vec![];
+        // RFC 13341 Section 7.2.1 suggests that the body should begin with a
+        // CRLF prior to the first boundary. The mime_multipart library doesn't
+        // do this, so we do it instead.
+        let mut body: Vec<u8> = vec![b'\r', b'\n'];
         write_multipart(&mut body, &boundary, &body_parts)
             .expect("Failed to write multipart body");