diff --git a/configure b/configure
index 6d3277c3d..19da65c30 100755
--- a/configure
+++ b/configure
@@ -12949,6 +12949,8 @@ $as_echo "$sudo_cv_var_daportable" >&6; }
 			*-*-hpux10.*)
 			    shadow_funcs="getprpwnam iscomsec"
 			    shadow_libs="-lsec"
+			    # HP-UX 10.20 libc has an incompatible getline
+			    ac_cv_func_getline="no"
 			;;
 			*)
 			    shadow_funcs="getspnam iscomsec"
diff --git a/configure.in b/configure.in
index 2f859c202..bed36e94f 100644
--- a/configure.in
+++ b/configure.in
@@ -1546,6 +1546,8 @@ case "$host" in
 			*-*-hpux10.*)
 			    shadow_funcs="getprpwnam iscomsec"
 			    shadow_libs="-lsec"
+			    # HP-UX 10.20 libc has an incompatible getline
+			    ac_cv_func_getline="no"
 			;;
 			*)
 			    shadow_funcs="getspnam iscomsec"