diff --git a/src/test/confidence/arrayassignment/test.sh b/src/test/confidence/arrayassignment/test.sh
index 570e2268..9f4206e2 100755
--- a/src/test/confidence/arrayassignment/test.sh
+++ b/src/test/confidence/arrayassignment/test.sh
@@ -1,4 +1,4 @@
-#!
+#!/bin/sh
 . ../testenv.sh
 voc aa.mod -m
 ./aa >result
diff --git a/src/test/confidence/hello/test.sh b/src/test/confidence/hello/test.sh
index ac683cb9..decaa458 100755
--- a/src/test/confidence/hello/test.sh
+++ b/src/test/confidence/hello/test.sh
@@ -1,4 +1,4 @@
-#!
+#!/bin/sh
 . ../testenv.sh
 # Generate mixed source and assembly code listing
 CFLAGS="-gstabs -g1 -Wa,-acdhln=hello.s" && voc hello.mod -m
diff --git a/src/test/confidence/language/test.sh b/src/test/confidence/language/test.sh
index a593488c..217e6c49 100644
--- a/src/test/confidence/language/test.sh
+++ b/src/test/confidence/language/test.sh
@@ -1,4 +1,4 @@
-#!
+#!/bin/sh
 . ../testenv.sh
 # Generate mixed source and assembly code listing
 voc TestLanguage.mod -m
diff --git a/src/test/confidence/lola/test.sh b/src/test/confidence/lola/test.sh
index 77f401e0..523dd7bb 100755
--- a/src/test/confidence/lola/test.sh
+++ b/src/test/confidence/lola/test.sh
@@ -1,4 +1,4 @@
-#!
+#!/bin/sh
 . ../testenv.sh
 voc LSS.Mod LSB.Mod LSC.Mod LSV.Mod lola.Mod -m
 ./Lola RISC5.Lola result
diff --git a/src/test/confidence/signal/test.sh b/src/test/confidence/signal/test.sh
index d18c022d..8e507edc 100755
--- a/src/test/confidence/signal/test.sh
+++ b/src/test/confidence/signal/test.sh
@@ -1,4 +1,4 @@
-#!
+#!/bin/sh
 . ../testenv.sh
 voc signal.mod -m
 ./SignalTest x &
diff --git a/src/test/confidence/testenv.sh b/src/test/confidence/testenv.sh
index 85352592..bd6ff5b0 100755
--- a/src/test/confidence/testenv.sh
+++ b/src/test/confidence/testenv.sh
@@ -1,4 +1,4 @@
-#!
+#!/bin/sh
 ## '.' this file from individual test.sh files.
 #set -e
 if which cygpath >/dev/null
diff --git a/src/test/confidence/testresult.sh b/src/test/confidence/testresult.sh
index 10a82930..9234ab82 100755
--- a/src/test/confidence/testresult.sh
+++ b/src/test/confidence/testresult.sh
@@ -1,4 +1,4 @@
-#!
+#!/bin/sh
 # '.' this from indiviual test.sh files
 if diff -b expected result
 then printf "PASSED: $PWD\n\n"