diff --git a/llvm/include/llvm-c/Error.h b/llvm/include/llvm-c/Error.h
--- a/llvm/include/llvm-c/Error.h
+++ b/llvm/include/llvm-c/Error.h
@@ -60,7 +60,7 @@
 /**
  * Returns the type id for llvm StringError.
  */
-LLVMErrorTypeId LLVMGetStringErrorTypeId();
+LLVMErrorTypeId LLVMGetStringErrorTypeId(void);
 
 #ifdef __cplusplus
 }