diff --git a/src/primitive_core.cc b/src/primitive_core.cc
index e484043ee..b962341b6 100644
--- a/src/primitive_core.cc
+++ b/src/primitive_core.cc
@@ -133,9 +133,8 @@ static Object* write_on_std(const uint8* bytes, size_t length, bool is_stdout, b
   fwrite_unlocked(bytes, 1, length, stream);
   if (newline) {
     fputc_unlocked('\n', stream);
-  } else {
-    fflush_unlocked(stream);
   }
+  fflush_unlocked(stream);
   funlockfile(stream);
   return process->null_object();
 }
@@ -147,9 +146,8 @@ static Object* write_on_std(const uint8* bytes, size_t length, bool is_stdout, b
   fwrite(bytes, 1, length, stream);
   if (newline) {
     fputc('\n', stream);
-  } else {
-    fflush(stream);
   }
+  fflush(stream);
   return process->null_object();
 }