diff --git a/configure.ac b/configure.ac
index bb6f3a3..61adc2a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -513,6 +513,7 @@
   AC_DEFINE_UNQUOTED([JEMALLOC_PREFIX], ["$JEMALLOC_PREFIX"])
   AC_DEFINE_UNQUOTED([JEMALLOC_CPREFIX], ["$JEMALLOC_CPREFIX"])
 fi
+AC_SUBST([JEMALLOC_CPREFIX])
 
 AC_ARG_WITH([export],
   [AS_HELP_STRING([--without-export], [disable exporting jemalloc public APIs])],