diff --git a/crates/languages/src/c.rs b/crates/languages/src/c.rs
index 3463f4505044c83c9ba8a0e602cf5bfa82e93e3f..8e90cf821368c0c88781b2d10e82ad9eaa05989c 100644
--- a/crates/languages/src/c.rs
+++ b/crates/languages/src/c.rs
@@ -166,13 +166,24 @@ impl super::LspAdapter for CLspAdapter {
             None => "",
         };
 
-        let label = completion
+        let mut label = completion
             .label
             .strip_prefix('•')
             .unwrap_or(&completion.label)
             .trim()
-            .to_owned()
-            + label_detail;
+            .to_owned();
+
+        if !label_detail.is_empty() {
+            let should_add_space = match completion.kind {
+                Some(lsp::CompletionItemKind::FUNCTION | lsp::CompletionItemKind::METHOD) => false,
+                _ => true,
+            };
+
+            if should_add_space && !label.ends_with(' ') && !label_detail.starts_with(' ') {
+                label.push(' ');
+            }
+            label.push_str(label_detail);
+        }
 
         match completion.kind {
             Some(lsp::CompletionItemKind::FIELD) if completion.detail.is_some() => {