diff --git a/include/llvm-c/lto.h b/include/llvm-c/lto.h
index 40110fddfc1..d960617fdc7 100644
--- a/include/llvm-c/lto.h
+++ b/include/llvm-c/lto.h
@@ -16,7 +16,9 @@
 #ifndef LLVM_C_LTO_H
 #define LLVM_C_LTO_H
 
+#ifndef __cplusplus
 #include <stdbool.h>
+#endif
 #include <stddef.h>
 #include <unistd.h>