diff --git a/src/nvim/runtime.c b/src/nvim/runtime.c
index 59f4f9957e..9cbf140f11 100644
--- a/src/nvim/runtime.c
+++ b/src/nvim/runtime.c
@@ -1993,14 +1993,19 @@ static char *do_source_buffer_init(source_cookie_T *sp, const exarg_T *eap, bool
     return NULL;
   }
 
-  if (ex_lua) {
-    // Use ":{range}lua buffer=<num>" as the script name
-    snprintf(IObuff, IOSIZE, ":{range}lua buffer=%d", curbuf->b_fnum);
+  char *fname;
+  if (curbuf->b_ffname != NULL) {
+    fname = xstrdup(curbuf->b_ffname);
   } else {
-    // Use ":source buffer=<num>" as the script name
-    snprintf(IObuff, IOSIZE, ":source buffer=%d", curbuf->b_fnum);
+    if (ex_lua) {
+      // Use ":{range}lua buffer=<num>" as the script name
+      snprintf(IObuff, IOSIZE, ":{range}lua buffer=%d", curbuf->b_fnum);
+    } else {
+      // Use ":source buffer=<num>" as the script name
+      snprintf(IObuff, IOSIZE, ":source buffer=%d", curbuf->b_fnum);
+    }
+    fname = xstrdup(IObuff);
   }
-  char *fname = xstrdup(IObuff);
 
   ga_init(&sp->buflines, sizeof(char *), 100);
   // Copy the lines from the buffer into a grow array
diff --git a/test/functional/ex_cmds/source_spec.lua b/test/functional/ex_cmds/source_spec.lua
index 4548e51624..f3e00dee0f 100644
--- a/test/functional/ex_cmds/source_spec.lua
+++ b/test/functional/ex_cmds/source_spec.lua
@@ -247,12 +247,15 @@ describe(':source', function()
         feed('dd')
 
         feed_command(':source')
-
+        local filepath = fn.expand('%:p')
+        if filepath == '' then
+          filepath = ':source buffer=1'
+        end
         eq(12, eval('g:c'))
         eq('  \\ 1\n "\\ 2', exec_lua('return _G.a'))
-        eq(':source buffer=1', api.nvim_get_var('sfile_value'))
-        eq(':source buffer=1', api.nvim_get_var('stack_value'))
-        eq(':source buffer=1', api.nvim_get_var('script_value'))
+        eq(filepath, api.nvim_get_var('sfile_value'))
+        eq(filepath, api.nvim_get_var('stack_value'))
+        eq(filepath, api.nvim_get_var('script_value'))
       end)
     end