diff --git a/src/osgText/shaders/text_frag.cpp b/src/osgText/shaders/text_frag.cpp
index 09b68444b..03661dd92 100644
--- a/src/osgText/shaders/text_frag.cpp
+++ b/src/osgText/shaders/text_frag.cpp
@@ -186,7 +186,7 @@ char text_frag[] = "$OSG_GLSL_VERSION\n"
                    "    vec2 origin = src_texCoord-vec2(delta_tc*0.5, delta_tc*0.5);\n"
                    "\n"
                    "    float numSamples = 3.0;\n"
-                   "    delta_tc = delta_tc/(numSamples-1);\n"
+                   "    delta_tc = delta_tc/(numSamples-1.0);\n"
                    "\n"
                    "    float background_alpha = 1.0;\n"
                    "\n"