diff --git a/src/node_options.cc b/src/node_options.cc
index 7ebb3c63aa..41116ec833 100644
--- a/src/node_options.cc
+++ b/src/node_options.cc
@@ -750,7 +750,7 @@ PerProcessOptionsParser::PerProcessOptionsParser(
             kAllowedInEnvironment);
   AddOption("--build-snapshot",
             "Generate a snapshot blob when the process exits."
-            "Currently only supported in the node_mksnapshot binary.",
+            " Currently only supported in the node_mksnapshot binary.",
             &PerProcessOptions::build_snapshot,
             kDisallowedInEnvironment);