diff --git a/libc/CMakeLists.txt b/libc/CMakeLists.txt
index e50897e8..c7e3a21d 100644
--- a/libc/CMakeLists.txt
+++ b/libc/CMakeLists.txt
@@ -47,7 +47,7 @@ add_custom_target(crtx-install
 add_library(libc ${LIBC_SOURCES})
 add_dependencies(libc headers crtx-install)
 
-target_compile_options(libc PRIVATE -g -Wstack-usage=512)
+target_compile_options(libc PRIVATE -O2 -g -Wstack-usage=512)
 target_compile_options(libc PUBLIC -Wall -Wextra -Werror -Wno-error=stack-usage=)
 
 add_custom_target(libc-install
diff --git a/libc/string.cpp b/libc/string.cpp
index f27fa29e..49f60c1a 100644
--- a/libc/string.cpp
+++ b/libc/string.cpp
@@ -17,7 +17,7 @@ int memcmp(const void* s1, const void* s2, size_t n)
 	return 0;
 }
 
-void* memcpy(void* __restrict__ dstp, const void* __restrict__ srcp, size_t n)
+void* memcpy(void* dstp, const void* srcp, size_t n)
 {
 	unsigned char* dst = static_cast<unsigned char*>(dstp);
 	const unsigned char* src = static_cast<const unsigned char*>(srcp);