diff --git a/include/soloud_file_hack_on.h b/include/soloud_file_hack_on.h
index 50a6b593..8b791787 100644
--- a/include/soloud_file_hack_on.h
+++ b/include/soloud_file_hack_on.h
@@ -43,8 +43,8 @@ extern int Soloud_Filehack_fread(void *dst, int s, int c, Soloud_Filehack *f);
 extern int Soloud_Filehack_fseek(Soloud_Filehack *f, int idx, int base);
 extern int Soloud_Filehack_ftell(Soloud_Filehack *f);
 extern int Soloud_Filehack_fclose(Soloud_Filehack *f);
-extern Soloud_Filehack * Soloud_Filehack_fopen(const char *aFilename, char *aMode);
-extern int Soloud_Filehack_fopen_s(Soloud_Filehack **f, const char* aFilename, char* aMode);
+extern Soloud_Filehack * Soloud_Filehack_fopen(const char *aFilename, const char *aMode);
+extern int Soloud_Filehack_fopen_s(Soloud_Filehack **f, const char* aFilename, const char* aMode);
 
 #ifdef __cplusplus
 }
diff --git a/src/core/soloud_file.cpp b/src/core/soloud_file.cpp
index 865bf3f0..d71a6a9e 100644
--- a/src/core/soloud_file.cpp
+++ b/src/core/soloud_file.cpp
@@ -53,11 +53,11 @@ namespace SoLoud
 		return d;
 	}
 
-DiskFile::DiskFile(FILE *fp):
-mFileHandle(fp)
-{
-
-}
+DiskFile::DiskFile(FILE *fp):
+mFileHandle(fp)
+{
+
+}
 
 	unsigned int DiskFile::read(unsigned char *aDst, unsigned int aBytes)
 	{
@@ -291,7 +291,7 @@ extern "C"
 		return 0;
 	}
 
-	Soloud_Filehack * Soloud_Filehack_fopen(const char *aFilename, char * /*aMode*/)
+	Soloud_Filehack * Soloud_Filehack_fopen(const char *aFilename, const char * /*aMode*/)
 	{
 		SoLoud::DiskFile *df = new SoLoud::DiskFile();
 		int res = df->open(aFilename);
@@ -303,9 +303,9 @@ extern "C"
 		return (Soloud_Filehack*)df;
 	}
 
-	int Soloud_Filehack_fopen_s(Soloud_Filehack** f, const char* aFilename, char* /*aMode*/)
+	int Soloud_Filehack_fopen_s(Soloud_Filehack** f, const char* aFilename, const char* /*aMode*/)
 	{
 		*f = Soloud_Filehack_fopen(aFilename, 0);
 		return 1;
 	}
-}
+}