diff --git a/include/map.h b/include/map.h
index 8c6dc0f..2468ca1 100644
--- a/include/map.h
+++ b/include/map.h
@@ -39,7 +39,7 @@ void updateBlockSizePx();
 
 // search and load map by name in storedMaps[] (map.c) 
 // stops program when map not found!
-void loadMapByName(char *name);
+void loadMapByName(const char *name);
 
 
 //load map by passed definition
diff --git a/src/input.c b/src/input.c
index c1adfff..9a38cf9 100644
--- a/src/input.c
+++ b/src/input.c
@@ -1,3 +1,5 @@
+#include <math.h>
+
 #include "input.h"
 #include "common.h"
 #include "SDL.h"
diff --git a/src/map.c b/src/map.c
index 879c3c0..a35cc62 100644
--- a/src/map.c
+++ b/src/map.c
@@ -130,7 +130,7 @@ void updateBlockSizePx(){
 //===========================
 // search and load map by name in storedMaps[] (map.c) 
 // stops program when map not found!
-void loadMapByName(char *name)
+void loadMapByName(const char *name)
 {
     // loop through all stored maps
     for (int i = 0; i < storedMapsCount; i++)