diff --git a/src/riot-rs-boards/Cargo.toml b/src/riot-rs-boards/Cargo.toml
index aab90a9fe..0d4cd7293 100644
--- a/src/riot-rs-boards/Cargo.toml
+++ b/src/riot-rs-boards/Cargo.toml
@@ -13,7 +13,7 @@ linkme.workspace = true
 
 riot-rs-rt = { path = "../riot-rs-rt" }
 
-ai-c3 = { optional=true, path="ai-c3" }
+ai-c3 = { optional = true, path = "ai-c3" }
 dwm1001 = { optional = true, path = "dwm1001" }
 lm3s6965evb = { optional = true, path = "lm3s6965evb" }
 microbit = { optional = true, path = "microbit" }