diff --git a/.gitignore b/.gitignore
index aef8952..db94bea 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,4 @@ stm32_charger*
 linker.map
 *.layout
 *.out
+.DS_Store
diff --git a/include/param_prj.h b/include/param_prj.h
index c6b113c..15387b5 100644
--- a/include/param_prj.h
+++ b/include/param_prj.h
@@ -126,9 +126,9 @@
 #define CAT_COMM     "Communication"
 
 // SKUDAK customization suffix: bump on every Skudak-side change so the OpenInverter
-// web UI shows a distinct version (e.g. "4=1.20.R-S3") and we can visually confirm
+// web UI shows a distinct version (e.g. "4=1.20.R-S4") and we can visually confirm
 // the right firmware is flashed. Match the stm32-sine -S<N> convention.
-#define VERSTR STRINGIFY(4=VER-S3)
+#define VERSTR STRINGIFY(4=VER-S4)
 
 /***** enums ******/
 
diff --git a/src/main.cpp b/src/main.cpp
index 24ab944..e0214b9 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -158,7 +158,11 @@ extern "C" void tim2_isr(void)
    scheduler->Run();
 }
 
-extern "C" int main(void)
+// C++ forbids a linkage specification on `main` (-Wpedantic). The reset_handler
+// in libopencm3's vector.c forward-declares `int main(void)` with default
+// linkage and resolves it at link time by symbol name, so dropping `extern "C"`
+// here doesn't affect how main is invoked at boot.
+int main(void)
 {
    extern const TERM_CMD termCmds[];