diff --git a/src/dbUtil.jl b/src/dbUtil.jl
index 885f449..08f7638 100644
--- a/src/dbUtil.jl
+++ b/src/dbUtil.jl
@@ -209,7 +209,7 @@ function generateUpdateSQL(table_name::String, pk_dict::AbstractDict{String, Any
     # Build SET clause
     set_parts = String[]
     for (key, value) in data
-        if key ∉ keys(data)
+        if key ∉ keys(pk_dict)
             value_str = isa(value, AbstractString) ? "'$value'" : "$value"
             push!(set_parts, "$(string(key)) = $value_str")
         end