diff --git a/tigervnc.spec b/tigervnc.spec
index a0a4829..5dbaa78 100644
--- a/tigervnc.spec
+++ b/tigervnc.spec
@@ -32,7 +32,7 @@ BuildRequires:  Mesa-devel
 BuildRequires:  autoconf
 BuildRequires:  automake
 BuildRequires:  cmake
-BuildRequires:  fltk-devel
+BuildRequires:  fltk-devel >= 1.3.3
 BuildRequires:  gcc-c++
 BuildRequires:  gcc-c++
 BuildRequires:  java-devel