diff --git a/autogen.sh b/autogen.sh
index 2ce7363..4d173f0 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -1,9 +1,9 @@
 #!/bin/sh
 
-if which libtoolize >/dev/null; then
+if command -v libtoolize >/dev/null 2>&1; then
   libtoolize --copy
 else
-  if which glibtoolize >/dev/null; then
+  if command -v glibtoolize >/dev/null 2>&1; then
     glibtoolize --copy
   fi
 fi