diff --git a/NEWS.md b/NEWS.md
index f888f82b5..e5da1e343 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,9 @@
 # rxode2 (development version)
 
+- Add `getRxNpars` to api.  This allows the development version of
+  `babelmixr2` to better check what model is loaded and unload/reload
+  as necessary.
+
 # rxode2 3.0.2
 
 - Bug fix for `api`, the censoring function pointer has been updated
diff --git a/src/init.c b/src/init.c
index 13982a808..ac12333ff 100644
--- a/src/init.c
+++ b/src/init.c
@@ -419,6 +419,8 @@ SEXP _rxode2_rxode2Ptr(void) {
   SEXP rxode2getRxNobs = PROTECT(R_MakeExternalPtrFn((DL_FUNC)&getRxNobs, R_NilValue, R_NilValue)); pro++;
   SEXP rxode2getRxNobs2 = PROTECT(R_MakeExternalPtrFn((DL_FUNC)&getRxNobs2, R_NilValue, R_NilValue)); pro++;
   SEXP rxode2getOpIndSolve = PROTECT(R_MakeExternalPtrFn((DL_FUNC)&getOpIndSolve, R_NilValue, R_NilValue)); pro++;
+  SEXP rxode2getRxNpars = PROTECT(R_MakeExternalPtrFn((DL_FUNC)&getRxNpars,
+                                                      R_NilValue, R_NilValue)); pro++;
 
 
 #define nVec 49
@@ -472,7 +474,7 @@ SEXP _rxode2_rxode2Ptr(void) {
   SET_VECTOR_ELT(ret, 45, rxode2getRxNobs);
   SET_VECTOR_ELT(ret, 46, rxode2getRxNobs2);
   SET_VECTOR_ELT(ret, 47, rxode2getOpIndSolve);
-  SET_VECTOR_ELT(ret, 48, getRxNpars);
+  SET_VECTOR_ELT(ret, 48, rxode2getRxNpars);
 
   SEXP retN = PROTECT(Rf_allocVector(STRSXP, nVec)); pro++;
   SET_STRING_ELT(retN, 0, Rf_mkChar("rxode2rxRmvnSEXP"));
@@ -523,8 +525,7 @@ SEXP _rxode2_rxode2Ptr(void) {
   SET_STRING_ELT(retN, 45, Rf_mkChar("rxode2getRxNobs"));
   SET_STRING_ELT(retN, 46, Rf_mkChar("rxode2getRxNobs2"));
   SET_STRING_ELT(retN, 47, Rf_mkChar("rxode2getOpIndSolve"));
-  SET_VECTOR_ELT(retN, 48, Rf_mkChar("rxode2getRxNpars"));
-
+  SET_STRING_ELT(retN, 48, Rf_mkChar("rxode2getRxNpars"));
 #undef nVec
 
   // Set the names attribute of the list