diff --git a/configure.ac b/configure.ac
index 76429ab..ce8be76 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7,7 +7,7 @@ AM_INIT_AUTOMAKE
 AC_DISABLE_STATIC
 
 # Default prefix for installation
-AC_PREFIX_DEFAULT()
+AC_PREFIX_DEFAULT(/usr)
 
 # Checks for programs.
 AC_PROG_CC_C99