diff --git a/alloca_trampoline_.c b/alloca_trampoline_.c
index 0670613..5d378c5 100644
--- a/alloca_trampoline_.c
+++ b/alloca_trampoline_.c
@@ -4,5 +4,5 @@ void _alloca_trampoline(size_t num, void (*callback)(void* restrict ptr, void* d
 {
     unsigned char ptr[num];
     callback(ptr, data);
-}
+} // C99 mandates empty line at EOF
 
diff --git a/build.rs b/build.rs
index 9dea064..7fbb466 100644
--- a/build.rs
+++ b/build.rs
@@ -7,7 +7,6 @@ fn build_tramp()
     let mut builder = cc::Build::new();
     // --std=c99 -W -Wall -Werror -pedantic -O3 -flto
     builder.flag("--std=c99")
-	.flag("--std=c99")
 	.flag("-W")
 	.flag("-Wall")
 	.flag("-Werror")
diff --git a/src/lib.rs b/src/lib.rs
index 2649456..3b5052b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2,6 +2,7 @@
 mod ffi;
 
 
+
 #[cfg(test)]
 mod tests {
     #[test]