diff --git a/include/llvm-c/Core.h b/include/llvm-c/Core.h
index e1a99531b55..40696e0aceb 100644
--- a/include/llvm-c/Core.h
+++ b/include/llvm-c/Core.h
@@ -208,8 +208,8 @@ void LLVMDisposeMessage(char *Message);
 /*===-- Modules -----------------------------------------------------------===*/
 
 /* Create and destroy contexts. */
-LLVMContextRef LLVMContextCreate();
-LLVMContextRef LLVMGetGlobalContext();
+LLVMContextRef LLVMContextCreate(void);
+LLVMContextRef LLVMGetGlobalContext(void);
 void LLVMContextDispose(LLVMContextRef C);
 
 /* Create and destroy modules. */