diff --git a/tests/rp/.cargo/config.toml b/tests/rp/.cargo/config.toml
index de7bb0e56..4337924cc 100644
--- a/tests/rp/.cargo/config.toml
+++ b/tests/rp/.cargo/config.toml
@@ -11,7 +11,6 @@ runner = "teleprobe client run"
 rustflags = [
   # Code-size optimizations.
   #"-Z", "trap-unreachable=no",
-  "-C", "inline-threshold=5",
   "-C", "no-vectorize-loops",
 ]
 
diff --git a/tests/stm32/.cargo/config.toml b/tests/stm32/.cargo/config.toml
index 8752da59b..d94342598 100644
--- a/tests/stm32/.cargo/config.toml
+++ b/tests/stm32/.cargo/config.toml
@@ -9,7 +9,6 @@ runner = "teleprobe client run"
 rustflags = [
   # Code-size optimizations.
   #"-Z", "trap-unreachable=no",
-  "-C", "inline-threshold=5",
   "-C", "no-vectorize-loops",
 ]