diff --git a/configure.ac b/configure.ac
index 569d725..d45ca34 100644
--- a/configure.ac
+++ b/configure.ac
@@ -123,7 +123,7 @@ if test -z "$LIBPOSTFIX"; then
   case "${host_os}" in
     *linux* )
       case "${host_cpu}" in
-        aarch64 | powerpc64 | powerpc64le | s390x | x86_64 | sparc64 )
+        aarch64 | powerpc64 | powerpc64le | s390x | x86_64 | sparc64 | riscv64 )
           LIBPOSTFIX="64"
           INTGOSIZE=64
           ;;