diff --git a/lib/std/math_builtin.c3 b/lib/std/math_builtin.c3
new file mode 100644
index 000000000..908e88c03
--- /dev/null
+++ b/lib/std/math_builtin.c3
@@ -0,0 +1,13 @@
+module std::math;
+
+fn float __roundevenf(float f) @extname("roundevenf") @weak
+{
+	// Slow implementation
+	return round(f / 2) * 2;
+}
+
+fn double __roundeven(double d) @extname("roundeven") @weak
+{
+	// Slow implementation
+	return round(d / 2) * 2;
+}
diff --git a/src/version.h b/src/version.h
index c895b5092..900da2d32 100644
--- a/src/version.h
+++ b/src/version.h
@@ -1 +1 @@
-#define COMPILER_VERSION "0.4.12"
\ No newline at end of file
+#define COMPILER_VERSION "0.4.13"
\ No newline at end of file