diff --git a/src/lib/efl/interfaces/efl_model_common.c b/src/lib/efl/interfaces/efl_model_common.c
index 3b32205a79..afe6a040ce 100644
--- a/src/lib/efl/interfaces/efl_model_common.c
+++ b/src/lib/efl/interfaces/efl_model_common.c
@@ -22,7 +22,7 @@ static const char EFL_MODEL_ERROR_PERMISSION_DENIED_STR[] = "Permission denied";
 static const char EFL_MODEL_ERROR_INCORRECT_VALUE_STR[]   = "Incorrect value";
 
 EAPI int
-efl_model_init()
+efl_model_init(void)
 {
    EFL_MODEL_ERROR_INCORRECT_VALUE = eina_error_msg_static_register(
                    EFL_MODEL_ERROR_INCORRECT_VALUE_STR);
diff --git a/src/lib/eina/eina_debug_monitor.c b/src/lib/eina/eina_debug_monitor.c
index ed65a34573..06e939b9a4 100644
--- a/src/lib/eina/eina_debug_monitor.c
+++ b/src/lib/eina/eina_debug_monitor.c
@@ -648,7 +648,7 @@ _eina_debug_monitor_signal_init(void)
 }
 
 static const char *
-_socket_home_get()
+_socket_home_get(void)
 {
    // get possible debug daemon socket directory base
    const char *dir = getenv("XDG_RUNTIME_DIR");
diff --git a/src/lib/eo/eo_add_fallback.c b/src/lib/eo/eo_add_fallback.c
index e00d7e829a..c38a827b28 100644
--- a/src/lib/eo/eo_add_fallback.c
+++ b/src/lib/eo/eo_add_fallback.c
@@ -64,7 +64,7 @@ _eo_call_stack_mem_free(void *ptr, size_t size)
 }
 
 static Efl_Object_Call_Stack *
-_eo_call_stack_create()
+_eo_call_stack_create(void)
 {
    Efl_Object_Call_Stack *stack;
 
diff --git a/src/lib/evas/canvas/evas_canvas3d_eet.c b/src/lib/evas/canvas/evas_canvas3d_eet.c
index 0c43e0622f..ca24450626 100644
--- a/src/lib/evas/canvas/evas_canvas3d_eet.c
+++ b/src/lib/evas/canvas/evas_canvas3d_eet.c
@@ -27,7 +27,7 @@ _evas_canvas3d_eet_file_new(void)
 }
 
 Eet_Data_Descriptor*
-_evas_canvas3d_eet_file_get()
+_evas_canvas3d_eet_file_get(void)
 {
    if(_file_descriptor == NULL)
      _evas_canvas3d_eet_file_init();
@@ -35,7 +35,7 @@ _evas_canvas3d_eet_file_get()
    return _file_descriptor;
 }
 void
-_evas_canvas3d_eet_file_init()
+_evas_canvas3d_eet_file_init(void)
 {
 /* initialization of bonding between structure units in eet file */
    Eet_Data_Descriptor_Class eddc;
@@ -158,7 +158,7 @@ _evas_canvas3d_eet_file_init()
 }
 
 void
-_evas_canvas3d_eet_descriptor_shutdown()
+_evas_canvas3d_eet_descriptor_shutdown(void)
 {
    eet_data_descriptor_free(_geometry_descriptor);
    _geometry_descriptor = NULL;
diff --git a/src/lib/evas/canvas/evas_gl.c b/src/lib/evas/canvas/evas_gl.c
index 5a71f1278c..0f4760c3ed 100644
--- a/src/lib/evas/canvas/evas_gl.c
+++ b/src/lib/evas/canvas/evas_gl.c
@@ -196,7 +196,7 @@ evas_gl_free(Evas_GL *evas_gl)
 }
 
 EAPI Evas_GL_Config *
-evas_gl_config_new()
+evas_gl_config_new(void)
 {
    Evas_GL_Config *cfg;
 
diff --git a/src/lib/evas/common3d/save_load/evas_model_load_save_common.c b/src/lib/evas/common3d/save_load/evas_model_load_save_common.c
index 8c129148bf..925793b0dc 100644
--- a/src/lib/evas/common3d/save_load/evas_model_load_save_common.c
+++ b/src/lib/evas/common3d/save_load/evas_model_load_save_common.c
@@ -26,7 +26,7 @@
 
 /* create new header */
 Evas_Model_Load_Save_Header
-evas_model_load_save_header_new()
+evas_model_load_save_header_new(void)
 {
    Evas_Model_Load_Save_Header header;
 
diff --git a/src/lib/evas/cserve2/evas_cs2_client.c b/src/lib/evas/cserve2/evas_cs2_client.c
index 62f0bfe7b7..626d79e858 100644
--- a/src/lib/evas/cserve2/evas_cs2_client.c
+++ b/src/lib/evas/cserve2/evas_cs2_client.c
@@ -306,7 +306,7 @@ _shared_index_close(Shared_Index *si)
 }
 
 static void
-_shared_index_close_all()
+_shared_index_close_all(void)
 {
    DBG("Closing all index files");
    if (_index.strings_entries.f)
@@ -325,7 +325,7 @@ _shared_index_close_all()
 }
 
 static Eina_Bool
-_server_reconnect()
+_server_reconnect(void)
 {
    _shared_index_close_all();
 
diff --git a/src/lib/evas/filters/evas_filter.c b/src/lib/evas/filters/evas_filter.c
index 8c9bdc859f..63ab6a3a53 100644
--- a/src/lib/evas/filters/evas_filter.c
+++ b/src/lib/evas/filters/evas_filter.c
@@ -1622,14 +1622,14 @@ static int init_cnt = 0;
 int _evas_filter_log_dom = 0;
 
 void
-evas_filter_init()
+evas_filter_init(void)
 {
    if ((init_cnt++) > 0) return;
    _evas_filter_log_dom = eina_log_domain_register("evas_filter", EVAS_FILTER_LOG_COLOR);
 }
 
 void
-evas_filter_shutdown()
+evas_filter_shutdown(void)
 {
    if ((--init_cnt) > 0) return;
    evas_filter_parser_shutdown();
diff --git a/src/lib/evas/main.c b/src/lib/evas/main.c
index e59877cdd6..8c31d8edd9 100644
--- a/src/lib/evas/main.c
+++ b/src/lib/evas/main.c
@@ -50,7 +50,7 @@ evas_mem_calloc(int size)
 }
 
 static void
-_evas_debug_init_from_env()
+_evas_debug_init_from_env(void)
 {
    const char *tmp = getenv("EVAS_DEBUG_SHOW");
    if (tmp)
diff --git a/src/modules/evas/model_loaders/obj/evas_model_load_obj.c b/src/modules/evas/model_loaders/obj/evas_model_load_obj.c
index 3ec4ed5274..2b18c61202 100644
--- a/src/modules/evas/model_loaders/obj/evas_model_load_obj.c
+++ b/src/modules/evas/model_loaders/obj/evas_model_load_obj.c
@@ -48,7 +48,7 @@ struct _OBJ_Counts
 
 /* create new counter */
 static inline OBJ_Counts
-_new_count_elements()
+_new_count_elements(void)
 {
    OBJ_Counts counts;
 
diff --git a/src/static_libs/draw/draw_main.c b/src/static_libs/draw/draw_main.c
index 3d920639ab..40b32e99da 100644
--- a/src/static_libs/draw/draw_main.c
+++ b/src/static_libs/draw/draw_main.c
@@ -278,7 +278,7 @@ efl_draw_func_span_get(Efl_Gfx_Render_Op op, uint32_t color, Eina_Bool src_alpha
 }
 
 int
-efl_draw_init()
+efl_draw_init(void)
 {
    static int i = 0;
    if (!(i++))
diff --git a/src/static_libs/draw/draw_main_neon.c b/src/static_libs/draw/draw_main_neon.c
index 044114733e..24b3d0146a 100644
--- a/src/static_libs/draw/draw_main_neon.c
+++ b/src/static_libs/draw/draw_main_neon.c
@@ -214,7 +214,7 @@ comp_func_source_over_sse2(uint32_t * __restrict dest, const uint32_t * __restri
 #endif
 
 void
-efl_draw_neon_init()
+efl_draw_neon_init(void)
 {
 #ifdef BUILD_NEON
    if (eina_cpu_features_get() & EINA_CPU_NEON)