diff --git a/src/targets/shell/curl/client.ts b/src/targets/shell/curl/client.ts
index d0ba163f..54d65a5c 100644
--- a/src/targets/shell/curl/client.ts
+++ b/src/targets/shell/curl/client.ts
@@ -122,13 +122,16 @@ export const curl: Client<CurlOptions> = {
       case 'multipart/form-data':
         postData.params?.forEach(param => {
           let post = '';
+          // If the parameter is a filename, we want to put shell quotes around
+          // it rather than URL quoting it. Curl wants `file='@img copy.jpg'`
+          // not `file=@img%20copy.jpg`, which it will fail to find
           if (param.fileName) {
-            post = `${param.name}=@${param.fileName}`;
+            post = `${param.name}='@${param.fileName}'`;
           } else {
-            post = `${param.name}=${param.value}`;
+            post = quote(`${param.name}=${param.value}`);
           }
 
-          push(`${arg('form')} ${quote(post)}`);
+          push(`${arg('form')} ${post}`);
         });
         break;
 
diff --git a/src/targets/shell/curl/fixtures/multipart-data.sh b/src/targets/shell/curl/fixtures/multipart-data.sh
index 693fabf3..42d3d3f6 100755
--- a/src/targets/shell/curl/fixtures/multipart-data.sh
+++ b/src/targets/shell/curl/fixtures/multipart-data.sh
@@ -1,5 +1,5 @@
 curl --request POST \
   --url https://httpbin.org/anything \
   --header 'content-type: multipart/form-data' \
-  --form foo=@src/fixtures/files/hello.txt \
+  --form foo='@src/fixtures/files/hello.txt' \
   --form 'bar=Bonjour le monde'
\ No newline at end of file
diff --git a/src/targets/shell/curl/fixtures/multipart-file.sh b/src/targets/shell/curl/fixtures/multipart-file.sh
index 5abea7b7..6ea03380 100755
--- a/src/targets/shell/curl/fixtures/multipart-file.sh
+++ b/src/targets/shell/curl/fixtures/multipart-file.sh
@@ -1,4 +1,4 @@
 curl --request POST \
   --url https://httpbin.org/anything \
   --header 'content-type: multipart/form-data' \
-  --form foo=@src/fixtures/files/hello.txt
\ No newline at end of file
+  --form foo='@src/fixtures/files/hello.txt'
\ No newline at end of file