diff --git a/modules/sd_vae_approx.py b/modules/sd_vae_approx.py
index c5dda7431..48ffd672d 100644
--- a/modules/sd_vae_approx.py
+++ b/modules/sd_vae_approx.py
@@ -44,6 +44,8 @@ def model():
         model_name = "vaeapprox-sd3.pt"
     elif shared.sd_model.is_sdxl:
         model_name = "vaeapprox-sdxl.pt"
+    elif shared.sd_model.is_flux1:
+        model_name = "vaeapprox-sd3.pt"
     else:
         model_name = "model.pt"
 
@@ -81,6 +83,18 @@ def cheap_approximation(sample):
             [ 0.0815,  0.0846,  0.1207], [-0.0120, -0.0055, -0.0867],
             [-0.0749, -0.0634, -0.0456], [-0.1418, -0.1457, -0.1259],
         ]
+    elif shared.sd_model.is_flux1:
+        coeffs = [
+            # from comfy
+            [-0.0404,  0.0159,  0.0609], [ 0.0043,  0.0298,  0.0850],
+            [ 0.0328, -0.0749, -0.0503], [-0.0245,  0.0085,  0.0549],
+            [ 0.0966,  0.0894,  0.0530], [ 0.0035,  0.0399,  0.0123],
+            [ 0.0583,  0.1184,  0.1262], [-0.0191, -0.0206, -0.0306],
+            [-0.0324,  0.0055,  0.1001], [ 0.0955,  0.0659, -0.0545],
+            [-0.0504,  0.0231, -0.0013], [ 0.0500, -0.0008, -0.0088],
+            [ 0.0982,  0.0941,  0.0976], [-0.1233, -0.0280, -0.0897],
+            [-0.0005, -0.0530, -0.0020], [-0.1273, -0.0932, -0.0680],
+        ]
     elif shared.sd_model.is_sdxl:
         coeffs = [
             [ 0.3448,  0.4168,  0.4395],