diff --git a/Applications/Terminal/main.cpp b/Applications/Terminal/main.cpp
index 7839372c20..f21f0866bd 100644
--- a/Applications/Terminal/main.cpp
+++ b/Applications/Terminal/main.cpp
@@ -148,7 +148,7 @@ int main(int argc, char** argv)
     if (chdir(get_current_user_home_path().characters()) < 0)
         perror("chdir");
 
-    int ptm_fd = open("/dev/ptmx", O_RDWR);
+    int ptm_fd = open("/dev/ptmx", O_RDWR | O_CLOEXEC);
     if (ptm_fd < 0) {
         perror("open(ptmx)");
         return 1;
diff --git a/DevTools/HackStudio/TerminalWrapper.cpp b/DevTools/HackStudio/TerminalWrapper.cpp
index 90ae3b3476..4319666994 100644
--- a/DevTools/HackStudio/TerminalWrapper.cpp
+++ b/DevTools/HackStudio/TerminalWrapper.cpp
@@ -24,7 +24,7 @@ void TerminalWrapper::run_command(const String& command)
         return;
     }
 
-    int ptm_fd = open("/dev/ptmx", O_RDWR);
+    int ptm_fd = open("/dev/ptmx", O_RDWR | O_CLOEXEC);
     if (ptm_fd < 0) {
         perror("open(ptmx)");
         ASSERT_NOT_REACHED();