diff --git a/src/sdps.jl b/src/sdps.jl
index 873d41d..5e61771 100644
--- a/src/sdps.jl
+++ b/src/sdps.jl
@@ -22,7 +22,7 @@ function constraints_from_pm(pm, total_length)
     n = size(pm,1)
     constraints = constraints = [Array{Int,1}[] for x in 1:total_length]
     for j in 1:n
-        Threads.@threads for i in 1:n
+        for i in 1:n
             idx = pm[i,j]
             push!(constraints[idx], [i,j])
         end