diff --git a/configure.in b/configure.in
index 457e687d..3b4a5a6b 100644
--- a/configure.in
+++ b/configure.in
@@ -783,7 +783,7 @@ if test "x$prefix" = xNONE; then
   prefix=$ac_default_prefix
 fi
 if test "x$exec_prefix" = xNONE; then
-  exec_prefix='$prefix'
+  exec_prefix='${prefix}'
 fi
 
 dnl Enable/disable debugging messages.