diff --git a/librz/arch/fcn.c b/librz/arch/fcn.c
index a27f119c408..08b3a48fdc9 100644
--- a/librz/arch/fcn.c
+++ b/librz/arch/fcn.c
@@ -1775,7 +1775,7 @@ RZ_API bool rz_analysis_fcn_add_bb(RzAnalysis *a, RzAnalysisFunction *fcn, ut64
 /**
  * \brief Returns the amount of loops located in the \p fcn function
  */
-RZ_API int rz_analysis_function_loops(RzAnalysisFunction *fcn) {
+RZ_API ut32 rz_analysis_function_loops(RzAnalysisFunction *fcn) {
 	RzAnalysisBlock *bb;
 	ut32 loops = 0;
 
@@ -1804,9 +1804,9 @@ RZ_API int rz_analysis_function_loops(RzAnalysisFunction *fcn) {
  * P is the number of connected components (exit nodes).
  *
  */
-RZ_API int rz_analysis_function_complexity(RzAnalysisFunction *fcn) {
+RZ_API ut32 rz_analysis_function_complexity(RzAnalysisFunction *fcn) {
 	RzAnalysis *analysis = fcn->analysis;
-	int E = 0, N = 0, P = 0;
+	ut32 E = 0, N = 0, P = 0;
 	RzAnalysisBlock *bb;
 
 	void **it;
@@ -1851,7 +1851,7 @@ RZ_API int rz_analysis_function_get_arg_count(RzAnalysis *analysis, RzAnalysisFu
 }
 
 // tfj and afsj call this function
-RZ_API char *rz_analysis_function_get_json(RzAnalysisFunction *function) {
+RZ_API RZ_OWN char *rz_analysis_function_get_json(RzAnalysisFunction *function) {
 	char *tmp = NULL;
 	RzAnalysis *a = function->analysis;
 	PJ *pj = pj_new();
@@ -2017,8 +2017,8 @@ RZ_API RzAnalysisFunction *rz_analysis_fcn_next(RzAnalysis *analysis, ut64 addr)
 	return closer;
 }
 
-RZ_API int rz_analysis_fcn_count(RzAnalysis *analysis, ut64 from, ut64 to) {
-	int n = 0;
+RZ_API ut32 rz_analysis_fcn_count(RzAnalysis *analysis, ut64 from, ut64 to) {
+	ut32 n = 0;
 	RzAnalysisFunction *fcni;
 	RzListIter *iter;
 	rz_list_foreach (analysis->fcns, iter, fcni) {
@@ -2105,10 +2105,10 @@ RZ_API ut32 rz_analysis_function_cost(RzAnalysisFunction *fcn) {
 	return totalCycles;
 }
 
-RZ_API int rz_analysis_function_count_edges(const RzAnalysisFunction *fcn, RZ_NULLABLE int *ebbs) {
+RZ_API ut32 rz_analysis_function_count_edges(const RzAnalysisFunction *fcn, RZ_NULLABLE int *ebbs) {
 	rz_return_val_if_fail(fcn, 0);
 	RzAnalysisBlock *bb;
-	int edges = 0;
+	ut32 edges = 0;
 	if (ebbs) {
 		*ebbs = 0;
 	}
diff --git a/librz/include/rz_analysis.h b/librz/include/rz_analysis.h
index b4915444984..c720cc9b641 100644
--- a/librz/include/rz_analysis.h
+++ b/librz/include/rz_analysis.h
@@ -1743,7 +1743,7 @@ RZ_API bool rz_analysis_add_device_peripheral_map(RzBinObject *o, RzAnalysis *an
 
 /* fcn.c */
 RZ_API ut32 rz_analysis_function_cost(RzAnalysisFunction *fcn);
-RZ_API int rz_analysis_function_count_edges(const RzAnalysisFunction *fcn, RZ_NULLABLE int *ebbs);
+RZ_API ut32 rz_analysis_function_count_edges(const RzAnalysisFunction *fcn, RZ_NULLABLE int *ebbs);
 
 // Use rz_analysis_get_functions_in¿() instead
 RZ_DEPRECATE RZ_API RzAnalysisFunction *rz_analysis_get_fcn_in(RzAnalysis *analysis, ut64 addr, int type);
@@ -1764,16 +1764,16 @@ RZ_API void rz_analysis_function_update_analysis(RzAnalysisFunction *fcn);
 RZ_API bool rz_analysis_task_item_new(RZ_NONNULL RzAnalysis *analysis, RZ_NONNULL RzVector /*<RzAnalysisTaskItem>*/ *tasks, RZ_NONNULL RzAnalysisFunction *fcn, RZ_NULLABLE RzAnalysisBlock *block, ut64 address, RzStackAddr sp);
 RZ_API int rz_analysis_run_tasks(RZ_NONNULL RzVector /*<RzAnalysisTaskItem>*/ *tasks);
 
-RZ_API int rz_analysis_function_complexity(RzAnalysisFunction *fcn);
-RZ_API int rz_analysis_function_loops(RzAnalysisFunction *fcn);
+RZ_API ut32 rz_analysis_function_complexity(RzAnalysisFunction *fcn);
+RZ_API ut32 rz_analysis_function_loops(RzAnalysisFunction *fcn);
 RZ_API void rz_analysis_trim_jmprefs(RzAnalysis *analysis, RzAnalysisFunction *fcn);
 RZ_API void rz_analysis_del_jmprefs(RzAnalysis *analysis, RzAnalysisFunction *fcn);
-RZ_API char *rz_analysis_function_get_json(RzAnalysisFunction *function);
+RZ_API RZ_OWN char *rz_analysis_function_get_json(RzAnalysisFunction *function);
 RZ_API RzAnalysisFunction *rz_analysis_fcn_next(RzAnalysis *analysis, ut64 addr);
 RZ_API RZ_OWN char *rz_analysis_function_get_signature(RZ_NONNULL RzAnalysisFunction *function);
 RZ_API void rz_analysis_function_set_type(RzAnalysis *a, RZ_NONNULL RzAnalysisFunction *f, RZ_NONNULL RzCallable *callable);
 RZ_API bool rz_analysis_function_set_type_str(RzAnalysis *a, RZ_NONNULL RzAnalysisFunction *f, RZ_NONNULL const char *sig);
-RZ_API int rz_analysis_fcn_count(RzAnalysis *a, ut64 from, ut64 to);
+RZ_API ut32 rz_analysis_fcn_count(RzAnalysis *a, ut64 from, ut64 to);
 RZ_API RzAnalysisBlock *rz_analysis_fcn_bbget_in(const RzAnalysis *analysis, RzAnalysisFunction *fcn, ut64 addr);
 RZ_API RzAnalysisBlock *rz_analysis_fcn_bbget_at(RzAnalysis *analysis, RzAnalysisFunction *fcn, ut64 addr);
 RZ_API int rz_analysis_function_resize(RzAnalysisFunction *fcn, int newsize);