diff --git a/src/layers/shims.jl b/src/layers/shims.jl
index 8ffc4e1b..bad409b9 100644
--- a/src/layers/shims.jl
+++ b/src/layers/shims.jl
@@ -1,7 +1,7 @@
 export Conv2D, MaxPool, Reshape
 
 type Conv2D <: Model
-  filter::Param{Array{Float32,4}} # [height, width, inchans, outchans]
+  filter::Param{Array{Float64,4}} # [height, width, inchans, outchans]
   stride::Dims{2}
 end