diff --git a/src/nlp/meta.jl b/src/nlp/meta.jl
index eee0d0c3..88d5cba2 100644
--- a/src/nlp/meta.jl
+++ b/src/nlp/meta.jl
@@ -143,6 +143,7 @@ function NLPModelMeta{T, S}(
   @lencheck nvar x0 lvar uvar
   @lencheck ncon y0 lcon ucon
   @rangecheck 1 ncon lin
+  @assert nnzj == lin_nnzj + nln_nnzj
 
   ifix = findall(lvar .== uvar)
   ilow = findall((lvar .> T(-Inf)) .& (uvar .== T(Inf)))