diff --git a/configure.ac b/configure.ac
index f90631e..1365759 100644
--- a/configure.ac
+++ b/configure.ac
@@ -15,7 +15,8 @@ LIBXML2_REQUIRED="2.6.0"
 LIBVIRT_REQUIRED="0.6.0"
 GTK2_REQUIRED="2.12.0"
 GTK3_REQUIRED="3.0"
-GTK_VNC_REQUIRED="0.4.3"
+GTK_VNC1_REQUIRED="0.3.8"
+GTK_VNC2_REQUIRED="0.4.0"
 SPICE_GTK_REQUIRED="0.9"
 
 AC_PROG_CC
@@ -80,11 +81,13 @@ AC_MSG_RESULT([$with_gtk])
 case "$with_gtk" in
   2.0) GTK_API_VERSION=2.0
        GTK_REQUIRED=$GTK2_REQUIRED
+       GTK_VNC_REQUIRED=$GTK_VNC1_REQUIRED
        GTK_VNC_API_VERSION=1.0
        SPICE_GTK_API_VERSION=2.0
        ;;
   3.0) GTK_API_VERSION=3.0
        GTK_REQUIRED=$GTK3_REQUIRED
+       GTK_VNC_REQUIRED=$GTK_VNC2_REQUIRED
        GTK_VNC_API_VERSION=2.0
        SPICE_GTK_API_VERSION=3.0
        ;;
diff --git a/virt-viewer.spec.in b/virt-viewer.spec.in
index 12fccfc..d1dbd45 100644
--- a/virt-viewer.spec.in
+++ b/virt-viewer.spec.in
@@ -40,9 +40,9 @@ BuildRequires: gtk2-devel >= 2.12.0
 BuildRequires: libvirt-devel >= 0.6.0
 BuildRequires: libxml2-devel
 %if %{with_gtk3}
-BuildRequires: gtk-vnc2-devel >= 0.4.3
+BuildRequires: gtk-vnc2-devel >= 0.4.0
 %else
-BuildRequires: gtk-vnc-devel >= 0.4.3
+BuildRequires: gtk-vnc-devel >= 0.3.8
 %endif
 %if %{with_spice}
 %if %{with_gtk3}