diff --git a/src/ast/fpa/fpa2bv_converter.cpp b/src/ast/fpa/fpa2bv_converter.cpp
index 18baba57c2d..21c71c8a955 100644
--- a/src/ast/fpa/fpa2bv_converter.cpp
+++ b/src/ast/fpa/fpa2bv_converter.cpp
@@ -3288,7 +3288,7 @@ void fpa2bv_converter::mk_to_ieee_bv_unspecified(func_decl * f, unsigned num, ex
 void fpa2bv_converter::mk_to_ieee_bv_i(func_decl * f, unsigned num, expr * const * args, expr_ref & result)
 {
     func_decl_ref fu(m.mk_func_decl(f->get_family_id(), OP_FPA_TO_IEEE_BV, 0, nullptr, num, args), m);
-    mk_to_bv(f, num, args, true, result);
+    mk_to_bv(fu, num, args, true, result);
 }
 
 void fpa2bv_converter::mk_to_bv(func_decl * f, unsigned num, expr * const * args, bool is_signed, expr_ref & result) {
@@ -3475,12 +3475,12 @@ void fpa2bv_converter::mk_to_sbv(func_decl * f, unsigned num, expr * const * arg
 
 void fpa2bv_converter::mk_to_ubv_i(func_decl * f, unsigned num, expr * const * args, expr_ref & result) {
     func_decl_ref fu(m.mk_func_decl(f->get_family_id(), OP_FPA_TO_UBV, 0, nullptr, num, args), m);
-    mk_to_bv(f, num, args, false, result);
+    mk_to_bv(fu, num, args, false, result);
 }
 
 void fpa2bv_converter::mk_to_sbv_i(func_decl * f, unsigned num, expr * const * args, expr_ref & result) {
     func_decl_ref fu(m.mk_func_decl(f->get_family_id(), OP_FPA_TO_SBV, 0, nullptr, num, args), m);
-    mk_to_bv(f, num, args, true, result);
+    mk_to_bv(fu, num, args, true, result);
 }
 
 expr_ref fpa2bv_converter::nan_wrap(expr * n) {
@@ -3529,7 +3529,7 @@ void fpa2bv_converter::mk_to_real_unspecified(func_decl * f, unsigned num, expr
 
 void fpa2bv_converter::mk_to_real_i(func_decl * f, unsigned num, expr * const * args, expr_ref & result) {
     func_decl_ref fu(m.mk_func_decl(f->get_family_id(), OP_FPA_TO_REAL, 0, nullptr, num, args), m);
-    mk_to_real(f, num, args, result);
+    mk_to_real(fu, num, args, result);
 }
 
 void fpa2bv_converter::mk_fp(func_decl * f, unsigned num, expr * const * args, expr_ref & result) {