diff --git a/SMILEBASIC/builtinfunctions.d b/SMILEBASIC/builtinfunctions.d
index 8df923b..70ea94b 100644
--- a/SMILEBASIC/builtinfunctions.d
+++ b/SMILEBASIC/builtinfunctions.d
@@ -3362,6 +3362,10 @@ class BuiltinFunction
             p.console.define(code, array.doubleArray.array);
         }
     }
+    static void FONTDEF(PetitComputer p)
+    {
+        p.console.initGRPF();
+    }
     //alias void function(PetitComputer, Value[], Value[]) BuiltinFunc;
     static BuiltinFunctions[wstring] builtinFunctions;
     static wstring getBasicName(BFD)(const wstring def)
diff --git a/SMILEBASIC/console.d b/SMILEBASIC/console.d
index 4412d17..e7d7cd5 100644
--- a/SMILEBASIC/console.d
+++ b/SMILEBASIC/console.d
@@ -524,4 +524,16 @@ class Console
         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, w, h, GL_BGRA, GL_UNSIGNED_BYTE, buffer);
         glFlush();
     }
+    void initGRPF()
+    {
+        if (GRPF)
+        {
+            GRPF.deleteGL();
+            GRPF.deleteSDL();
+        }
+        GRPF = petitcom.graphic.createGRPF(petitcom.fontFile);
+        petitcom.graphic.GRPFWidth = GRPF.surface.w;
+        petitcom.graphic.GRPFHeight = GRPF.surface.h;
+        GRPF.createTexture(petitcom.renderer, petitcom.textureScaleMode);
+    }
 }
\ No newline at end of file
diff --git a/SMILEBASIC/petitcomputer.d b/SMILEBASIC/petitcomputer.d
index 5683718..f807e63 100644
--- a/SMILEBASIC/petitcomputer.d
+++ b/SMILEBASIC/petitcomputer.d
@@ -736,10 +736,7 @@ class PetitComputer
                 return;
             }
             SDL_GL_MakeCurrent(window, context);
-            console.GRPF = graphic.createGRPF(fontFile);
-            graphic.GRPFWidth = console.GRPF.surface.w;
-            graphic.GRPFHeight = console.GRPF.surface.h;
-            console.GRPF.createTexture(renderer, textureScaleMode);
+            console.initGRPF();
             glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
             glEnable(GL_DEPTH_TEST);
             version(Windows)
@@ -1669,7 +1666,7 @@ class PetitComputer
         }
         if (fontdef)
         {
-            //TODO
+            this.console.initGRPF();
         }
 
     }