diff --git a/build/simh/build.tcl b/build/simh/build.tcl
index 7d95a4ee..43df068e 100644
--- a/build/simh/build.tcl
+++ b/build/simh/build.tcl
@@ -37,6 +37,7 @@ proc create_tape {file} {
 
 proc quit_emulator {} {
     respond "sim>" "q\r"
+    expect eof
 }
 
 proc initialize_comsat {} {
diff --git a/build/sims/build.tcl b/build/sims/build.tcl
index fe320a25..2003d1e9 100644
--- a/build/sims/build.tcl
+++ b/build/sims/build.tcl
@@ -43,6 +43,7 @@ proc create_tape {file} {
 
 proc quit_emulator {} {
     respond "sim>" "q\r"
+    expect eof
 }
 
 proc initialize_comsat {} {