diff --git a/src/Utils.cpp b/src/Utils.cpp
index 2d65daf2b..c1436590e 100644
--- a/src/Utils.cpp
+++ b/src/Utils.cpp
@@ -177,7 +177,7 @@ std::string getFullPath(const std::string &path) {
     if (path[0]=='/') return path;
     char tmp[PATH_MAX];
     char * ret = realpath(path.c_str(), tmp);
-    if( tmp != 0 ) printf(std::string("fail to get full path of "+path+"\n").c_str());
+    if (tmp != 0) printf("fail to get full path of %s\n", path.c_str());
     return std::string(tmp);
 }
 
diff --git a/src/_test_runtime.cpp b/src/_test_runtime.cpp
index c82303a18..84510e15e 100644
--- a/src/_test_runtime.cpp
+++ b/src/_test_runtime.cpp
@@ -208,7 +208,7 @@ extern "C" void __stat_file_close(const char *func_name,char *str){
 
     FILE *f;
     f = fopen(tmp_file, "w");
-    fprintf(f,str);
+    fputs(str, f);
     fclose(f);
     free(str);
 }