diff --git a/CMakeLists.txt b/CMakeLists.txt
index 376bf6620457d5892beb6c83a95f5aebe8aabee5..983ce1933f5cddbfaff8f28ebdb8604f2a737dbb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -691,7 +691,7 @@ add_custom_command(
 
 set(BUILD_COMPILER_RT_ARGS
   "${PROJECT_SOURCE_DIR}/lib"
-  build-obj -ofmt=c -OReleaseSmall
+  build-obj -ofmt=c -lc -OReleaseSmall
   --name compiler_rt
   -femit-bin="${ZIG_COMPILER_RT_C_SOURCE}"
   -target "${ZIG_HOST_TARGET_TRIPLE}"
diff --git a/bootstrap.c b/bootstrap.c
index f020f6a5518d997a2635c147976892bfa0307149..71c955ce65628394b22e0bb732893ad86a223514 100644
--- a/bootstrap.c
+++ b/bootstrap.c
@@ -212,7 +212,7 @@ int main(int argc, char **argv) {
     {
         const char *child_argv[] = {
             "./zig1", "lib", "build-obj",
-            "-ofmt=c", "-OReleaseSmall",
+            "-ofmt=c", "-lc", "-OReleaseSmall",
             "--name", "compiler_rt", "-femit-bin=compiler_rt.c",
             "-target", host_triple,
             "-Mroot=lib/compiler_rt.zig",