diff --git a/lldb/tools/yaml2macho-core/yaml2macho.cpp b/lldb/tools/yaml2macho-core/yaml2macho.cpp
index 85979a37d167..c29ae282d857 100644
--- a/lldb/tools/yaml2macho-core/yaml2macho.cpp
+++ b/lldb/tools/yaml2macho-core/yaml2macho.cpp
@@ -72,7 +72,7 @@ int main(int argc, char **argv) {
     exit(1);
   }
 
-  FILE *input = fopen(InputFilename.c_str(), "r");
+  FILE *input = fopen(InputFilename.c_str(), "rb");
   if (!input) {
     fprintf(stderr, "Unable to open %s, exiting\n", InputFilename.c_str());
     exit(1);