diff --git a/src/PRIMA.jl b/src/PRIMA.jl
index 7681fcd..e7a9034 100644
--- a/src/PRIMA.jl
+++ b/src/PRIMA.jl
@@ -288,7 +288,7 @@ function bobyqa!(f, x::DenseVector{Cdouble};
     fp = _push_wrapper(fw) # pointer to C-callable function
     try
         # Call low-level optimizer.
-        rc = prima_bobyqa(calfun, n, x, f, xl, xu, nf, rhobeg, rhoend, ftarget, maxfun, npt, iprint)
+        rc = prima_bobyqa(fp, n, x, fx, xl, xu, nf, rhobeg, rhoend, ftarget, maxfun, npt, iprint)
         return (fx[], Int(nf[]), rc)
     finally
         _pop_wrapper(fw)
@@ -321,7 +321,7 @@ function newuoa!(f, x::DenseVector{Cdouble};
     fp = _push_wrapper(fw) # pointer to C-callable function
     try
         # Call low-level optimizer.
-        rc = prima_newuoa(calfun, n, x, f, nf, rhobeg, rhoend, ftarget, maxfun, npt, iprint)
+        rc = prima_newuoa(fp, n, x, fx, nf, rhobeg, rhoend, ftarget, maxfun, npt, iprint)
         return (fx[], Int(nf[]), rc)
     finally
         _pop_wrapper(fw)
@@ -352,7 +352,7 @@ function uobyqa!(f, x::DenseVector{Cdouble};
     fp = _push_wrapper(fw) # pointer to C-callable function
     try
         # Call low-level optimizer.
-        rc = prima_uobyqa(calfun, n, x, f, nf, rhobeg, rhoend, ftarget, maxfun, iprint)
+        rc = prima_uobyqa(fp, n, x, fx, nf, rhobeg, rhoend, ftarget, maxfun, iprint)
         return (fx[], Int(nf[]), rc)
     finally
         _pop_wrapper(fw)
@@ -398,9 +398,9 @@ function cobyla!(f, x::DenseVector{Cdouble};
 
     try
         # Call low-level optimizer.
-        rc = GC.@preserve nlconstr ineqconstr eqconstr prima_cobyla(m_nlcon, calcfc,
-             n, x, f, cstrv, nlconstr, m_ineq, Aineq, bineq, m_eq, Aeq, beq, xl, xu,
-             nf, rhobeg, rhoend, ftarget, maxfun, iprint)
+        rc = GC.@preserve nlconstr ineqconstr eqconstr prima_cobyla(m_nlcon, fp,
+             n, x, fx, cstrv, nlcon_ptr, m_ineq, A_ineq, b_ineq, m_eq, A_eq, b_eq,
+            xl, xu, nf, rhobeg, rhoend, ftarget, maxfun, iprint)
         return (fx[], Int(nf[]), rc, cstrv[])
     finally
         _pop_wrapper(fw)
@@ -443,8 +443,8 @@ function lincoa!(f, x::DenseVector{Cdouble};
     fp = _push_wrapper(fw)    # pointer to C-callable function
     try
         # Call low-level optimizer.
-        rc = GC.@preserve ineqconstr eqconstr prima_lincoa(calfun, n, x, f,
-             cstrv, m_ineq, Aineq, bineq, m_eq, Aeq, beq, xl, xu, nf,
+        rc = GC.@preserve ineqconstr eqconstr prima_lincoa(fp, n, x, fx,
+             cstrv, m_ineq, A_ineq, b_ineq, m_eq, A_eq, b_eq, xl, xu, nf,
              rhobeg, rhoend, ftarget, maxfun, npt, iprint)
         return (fx[], Int(nf[]), rc, cstrv[])
     finally
diff --git a/src/wrappers.jl b/src/wrappers.jl
index d9e2ace..dd42b7b 100644
--- a/src/wrappers.jl
+++ b/src/wrappers.jl
@@ -1,26 +1,26 @@
-@enum prima_message::UInt32 begin
-    PRIMA_MSG_NONE = 0
-    PRIMA_MSG_EXIT = 1
-    PRIMA_MSG_RHO = 2
-    PRIMA_MSG_FEVL = 3
+@enum Message::Int32 begin
+    MSG_NONE = 0
+    MSG_EXIT = 1
+    MSG_RHO = 2
+    MSG_FEVL = 3
 end
 
-@enum prima_rc::Int32 begin
-    PRIMA_SMALL_TR_RADIUS = 0
-    PRIMA_FTARGET_ACHIEVED = 1
-    PRIMA_TRSUBP_FAILED = 2
-    PRIMA_MAXFUN_REACHED = 3
-    PRIMA_MAXTR_REACHED = 20
-    PRIMA_NAN_INF_X = -1
-    PRIMA_NAN_INF_F = -2
-    PRIMA_NAN_INF_MODEL = -3
-    PRIMA_NO_SPACE_BETWEEN_BOUNDS = 6
-    PRIMA_DAMAGING_ROUNDING = 7
-    PRIMA_ZERO_LINEAR_CONSTRAINT = 8
-    PRIMA_INVALID_INPUT = 100
-    PRIMA_ASSERTION_FAILS = 101
-    PRIMA_VALIDATION_FAILS = 102
-    PRIMA_MEMORY_ALLOCATION_FAILS = 103
+@enum Status::Int32 begin
+    SMALL_TR_RADIUS = 0
+    FTARGET_ACHIEVED = 1
+    TRSUBP_FAILED = 2
+    MAXFUN_REACHED = 3
+    MAXTR_REACHED = 20
+    NAN_INF_X = -1
+    NAN_INF_F = -2
+    NAN_INF_MODEL = -3
+    NO_SPACE_BETWEEN_BOUNDS = 6
+    DAMAGING_ROUNDING = 7
+    ZERO_LINEAR_CONSTRAINT = 8
+    INVALID_INPUT = 100
+    ASSERTION_FAILS = 101
+    VALIDATION_FAILS = 102
+    MEMORY_ALLOCATION_FAILS = 103
 end
 
 function prima_get_rc_string(rc)