diff --git a/houston.txt b/houston.txt
index cdd72a4c4..5c4684525 100644
--- a/houston.txt
+++ b/houston.txt
@@ -1,10 +1,10 @@
 The origin can be traced to the phrase in past tense
-(“Houston, we've had a problem here”) that was used
+(“Houston, we've had a problem here") that was used
 by the crew of the Apollo 13 moon flight, to report
 a major technical problem back to their Houston base.
 The phrase is normally misquoted as “Houston, we
-have a problem” as in the movie Apollo 13:
-“Houston, we have a problem”. See Houston, We've
+have a problem" as in the movie Apollo 13:
+“Houston, we have a problem". See Houston, We've
 Had a Problem (NASA).
 
 That is life..