diff --git a/src/rmodels.c b/src/rmodels.c
index b4a2988aa..f7ecb805e 100644
--- a/src/rmodels.c
+++ b/src/rmodels.c
@@ -1943,10 +1943,11 @@ bool ExportMesh(Mesh mesh, const char *fileName)
     if (IsFileExtension(fileName, ".obj"))
     {
         // Estimated data size, it should be enough...
-        int dataSize = mesh.vertexCount*(int)strlen("v -0000.000000f -0000.000000f -0000.000000f\n") +
-                       mesh.vertexCount*(int)strlen("vt -0.000000f -0.000000f\n") +
-                       mesh.vertexCount*(int)strlen("vn -0.0000f -0.0000f -0.0000f\n") +
-                       mesh.triangleCount*(int)strlen("f 00000/00000/00000 00000/00000/00000 00000/00000/00000\n");
+        int vc = mesh.vertexCount;
+        int dataSize = vc*(int)strlen("v -0000.000000f -0000.000000f -0000.000000f\n") +
+                       vc*(int)strlen("vt -0.000000f -0.000000f\n") +
+                       vc*(int)strlen("vn -0.0000f -0.0000f -0.0000f\n") +
+                       mesh.triangleCount*snprintf(NULL, 0, "f %i/%i/%i %i/%i/%i %i/%i/%i\n", vc, vc, vc, vc, vc, vc, vc, vc, vc);
 
         // NOTE: Text data buffer size is estimated considering mesh data size
         char *txtData = (char *)RL_CALLOC(dataSize + 1000, sizeof(char));