diff --git a/CMakeLists.txt b/CMakeLists.txt
index af2fced..fe0df2c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,7 +6,7 @@ add_executable(controller main.c)
 option(WIRING_PI_DEBUG "Use WiringPi Debugging Tool (0=off, 1=silent, 2=LOG_DEBUG) (0)" OFF)
 option(LOG_LEVEL "Set logging level (5=trace, 4=debug, 3=info, 2=warn, 1=error, 0=fatal) (3)" OFF)
 
-SET(CMAKE_C_FLAGS "-Wall -Wextra -lwiringPi -lwiringPiDev -luuid -llmdb -g")
+SET(CMAKE_C_FLAGS "-Wall -Wextra -Werror -Wpedantic -lwiringPi -lwiringPiDev -luuid -llmdb -g")
 
 string(LENGTH "${CMAKE_SOURCE_DIR}/" SOURCE_PATH_SIZE)
 add_definitions("-DSOURCE_PATH_SIZE=${SOURCE_PATH_SIZE}")
diff --git a/models/controller.c b/models/controller.c
index 77ffff9..b14a2a3 100644
--- a/models/controller.c
+++ b/models/controller.c
@@ -60,11 +60,11 @@ controller_debug(controller_t *controller)
     }
     char uuid_str[37];
     uuid_unparse(controller->id, uuid_str);
-    LOG_DEBUG("(1/5) %s @ %p", uuid_str, controller);
+    LOG_DEBUG("(1/5) %s @ %p", uuid_str, (void*)controller);
     LOG_DEBUG("(2/5) name: %s", controller->name);
     LOG_DEBUG("(3/5) command_port: %5d discovery_port: %5d", controller->command_port, controller->discovery_port);
     LOG_DEBUG("(4/5) relay count: %3d", controller->relay_count);
-    LOG_DEBUG("(5/5) relays @ %p:", controller->relays);
+    LOG_DEBUG("(5/5) relays @ %p:", (void*)controller->relays);
     for(uint8_t i = 0; i < controller->relay_count; ++i)
     {
         relay_debug(controller->relays[i]);
diff --git a/models/relay.c b/models/relay.c
index 87ee257..48e59c0 100644
--- a/models/relay.c
+++ b/models/relay.c
@@ -65,7 +65,7 @@ relay_debug(relay_t *relay)
         LOG_DEBUG("relay is NULL");
         return;
     }
-    LOG_DEBUG("(1/3) %d @ %p", relay->number, relay);
+    LOG_DEBUG("(1/3) %d @ %p", relay->number, (void*)relay);
     LOG_DEBUG("(2/3) name: %s", relay->name);
     LOG_DEBUG("(3/3) schedule:");
     schedule_debug(relay->schedule);
diff --git a/models/relay_load.c b/models/relay_load.c
index 1d4a76d..141f7c2 100644
--- a/models/relay_load.c
+++ b/models/relay_load.c
@@ -14,8 +14,8 @@ relay_load_single(MDB_txn *mdb_txn, MDB_dbi mdb_dbi, db_key_relay_e key_relay, u
 
     size_t key_size = sizeof(db_key_relay_e) + sizeof(uint8_t); 
     void *key_data = malloc(key_size);
-    memmove(key_data, &key_relay, sizeof(db_key_relay_e));
-    memmove(key_data + sizeof(db_key_relay_e), &num, sizeof(uint8_t));
+    memmove((uint8_t*)key_data, &key_relay, sizeof(db_key_relay_e));
+    memmove((uint8_t*)key_data + sizeof(db_key_relay_e), &num, sizeof(uint8_t));
 
     MDB_val key;
     key.mv_size = key_size;
diff --git a/models/relay_save.c b/models/relay_save.c
index e932940..ff91c9e 100644
--- a/models/relay_save.c
+++ b/models/relay_save.c
@@ -14,8 +14,8 @@ relay_save_single(MDB_txn *mdb_txn, MDB_dbi mdb_dbi, db_key_relay_e key_relay, u
 
     size_t key_size = sizeof(db_key_relay_e) + sizeof(uint8_t); 
     void *key_data = malloc(key_size);
-    memmove(key_data, &key_relay, sizeof(db_key_relay_e));
-    memmove(key_data + sizeof(db_key_relay_e), &num, sizeof(uint8_t));
+    memmove((uint8_t*)key_data, &key_relay, sizeof(db_key_relay_e));
+    memmove((uint8_t*)key_data + sizeof(db_key_relay_e), &num, sizeof(uint8_t));
 
     MDB_val key;
     key.mv_size = key_size;
diff --git a/models/schedule.c b/models/schedule.c
index ee37df6..901e2ef 100644
--- a/models/schedule.c
+++ b/models/schedule.c
@@ -66,7 +66,7 @@ schedule_debug(schedule_t *schedule)
     }
     char uuid_str[37];
     uuid_unparse(schedule->id, uuid_str);
-    LOG_DEBUG("(1/3) %s @ %p", uuid_str, schedule);
+    LOG_DEBUG("(1/3) %s @ %p", uuid_str, (void*)schedule);
     LOG_DEBUG("(2/3) period count: %3d", schedule->length);
 
     // one block: "HH:MM-HH:MM, " --> size: 13 (14 with '\0')
diff --git a/vendor/confini.c b/vendor/confini.c
index 63ca3c7..25353a7 100644
--- a/vendor/confini.c
+++ b/vendor/confini.c
@@ -1959,6 +1959,7 @@ static size_t further_cuts (char * const srcstr, const IniFormat format) {
 					follow (switch case fallthrough).
 
 				*/
+                __attribute__((fallthrough));
 
 			case _LIBCONFINI_VT_:
 			case _LIBCONFINI_FF_:
@@ -2527,6 +2528,7 @@ int strip_ini_cache (
 						(switch case fallthrough).
 
 					*/
+                    __attribute__((fallthrough));
 
 				case _LIBCONFINI_SC_INT_MARKER_:
 
@@ -2819,7 +2821,7 @@ int load_ini_file (
 
 	}
 
-	if (file_size > SIZE_MAX) {
+	if ((size_t) file_size > SIZE_MAX) {
 
 		return CONFINI_EFBIG;
 
@@ -2835,7 +2837,7 @@ int load_ini_file (
 
 	rewind(ini_file);
 
-	if (fread(cache, 1, (size_t) file_size, ini_file) < file_size) {
+	if (fread(cache, 1, (size_t) file_size, ini_file) < (size_t) file_size) {
 
 		free(cache);
 		return CONFINI_EIO;
@@ -2911,7 +2913,7 @@ int load_ini_path (
 
 	}
 
-	if (file_size > SIZE_MAX) {
+	if ((size_t) file_size > SIZE_MAX) {
 
 		return CONFINI_EFBIG;
 
@@ -2927,7 +2929,7 @@ int load_ini_path (
 
 	rewind(ini_file);
 
-	if (fread(cache, 1, (size_t) file_size, ini_file) < file_size) {
+	if (fread(cache, 1, (size_t) file_size, ini_file) < (size_t) file_size) {
 
 		free(cache);
 		return CONFINI_EIO;