diff --git a/autogen.sh b/autogen.sh
index b915230de..6cd7eb44e 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -30,7 +30,7 @@ fi
   DIE=1
 }
 
-(grep "^AM_PROG_LEX" $srcdir/configure.ac >/dev/null) && {
+(grep "^AC_PROG_LEX" $srcdir/configure.ac >/dev/null) && {
   (lex --version) < /dev/null > /dev/null 2>&1 || {
     echo
     echo "**Error**: You must have \`lex' installed."
@@ -40,7 +40,7 @@ fi
   }
 }
 
-(grep "^AM_PROG_YACC" $srcdir/configure.ac >/dev/null) && {
+(grep "^AC_PROG_YACC" $srcdir/configure.ac >/dev/null) && {
   (yacc --version) < /dev/null > /dev/null 2>&1 || {
     echo
     echo "**Error**: You must have \`yacc' installed."
diff --git a/configure.ac b/configure.ac
index d91d07e77..be72913ac 100644
--- a/configure.ac
+++ b/configure.ac
@@ -47,7 +47,7 @@ DX_PS_FEATURE(OFF)
 DX_INIT_DOXYGEN([icinga], [docs/Doxyfile], [docs/dev])
 
 AC_PROG_INSTALL
-AM_PROG_LEX
+AC_PROG_LEX
 AC_PROG_YACC
 AC_PROG_LIBTOOL
 AX_CXX_GCC_ABI_DEMANGLE