diff --git a/src/configure b/src/configure
index 7f396262a..85144c2d7 100755
--- a/src/configure
+++ b/src/configure
@@ -1476,7 +1476,8 @@ Optional Features:
   --enable-gengc          use generational garbage collection. Requires
                           Boehm-Weiser gc. (no|yes, default=NO)
   --enable-precisegc      use type information during garbage collection.
-                          Requires Boehm-Weiser gc. (no|yes, default=NO)
+                          Requires Boehm-Weiser gc (EXPERIMENTAL). (no|yes,
+                          default=NO)
 
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
@@ -2360,7 +2361,7 @@ fi
 if test "${enable_precisegc+set}" = set; then
   enableval=$enable_precisegc; enable_precisegc=${enableval}
 else
-  enable_precisegc=yes
+  enable_precisegc=no
 fi
 
 
diff --git a/src/configure.in b/src/configure.in
index c298a17dd..df684f561 100644
--- a/src/configure.in
+++ b/src/configure.in
@@ -242,9 +242,9 @@ AC_ARG_ENABLE(gengc,
 
 AC_ARG_ENABLE(precisegc,
   AS_HELP_STRING( [--enable-precisegc],
-		  [use type information during garbage collection. Requires Boehm-Weiser gc.]
+		  [use type information during garbage collection. Requires Boehm-Weiser gc (EXPERIMENTAL).]
 		  [(no|yes, default=NO)]),
-  [enable_precisegc=${enableval}], [enable_precisegc=yes] )
+  [enable_precisegc=${enableval}], [enable_precisegc=no] )
 
 dnl AC_ARG_ENABLE(debug,
 dnl   AS_HELP_STRING( [--enable-debug],