diff --git a/m4/matho b/m4/matho
index f64b5ed..4d97db7 100755
--- a/m4/matho
+++ b/m4/matho
@@ -1,4 +1,4 @@
-#!/bin/sh
+#! /usr/bin/sh
 # This shell script runs Mathomatic with the GNU m4 macro pre-processor so that
 # standard math functions such as sqrt(x), sin(x), etc. may be easily entered.
 # Hyperbolic trig has "h" appended, like sinh(x) for hyperbolic sine.
diff --git a/m4/rmath b/m4/rmath
index 74eae24..a477285 100755
--- a/m4/rmath
+++ b/m4/rmath
@@ -1,4 +1,4 @@
-#!/bin/sh
+#! /usr/bin/sh
 # This shell script runs m4 Mathomatic (matho) with readline capability.
 # Uses rlwrap program, if available, which is a readline front end.
 # The rlwrap program may be obtained at