diff --git a/library/compiler-builtins/build.rs b/library/compiler-builtins/build.rs
index f948edba9eb..701c4d4950b 100644
--- a/library/compiler-builtins/build.rs
+++ b/library/compiler-builtins/build.rs
@@ -449,6 +449,8 @@ mod c {
                 ("__fixunstfsi", "fixunstfsi.c"),
                 ("__floatunsitf", "floatunsitf.c"),
                 ("__fe_getround", "fp_mode.c"),
+                ("__divtf3", "divtf3.c"),
+                ("__trunctfdf2", "trunctfdf2.c"),
             ]);
         }