diff --git a/prebuilt/conanfile.py b/prebuilt/conanfile.py
index 63d8c3c..004d7d7 100644
--- a/prebuilt/conanfile.py
+++ b/prebuilt/conanfile.py
@@ -65,7 +65,7 @@ def package_info(self):
         self.cpp_info.exelinkflags = [
             f"-specs={PICOLIB_CPP_SPECS}",
             f"--picolibc-prefix={PREFIX}",
-            f"-oslib={str(self.options.crt0)}",
+            f"--oslib={str(self.options.crt0)}",
         ]
 
         self.output.info(f"link flags: {self.cpp_info.exelinkflags}")