diff --git a/macos.c b/macos.c
index 93bc00eea..38e58f54b 100644
--- a/macos.c
+++ b/macos.c
@@ -52,7 +52,7 @@ void subsurface_set_conf_int(const char *name, int value)
 	CFPreferencesSetAppValue(CFSTR_VAR(name), numRef, SUBSURFACE_PREFERENCES);
 }
 
-const char *subsurface_get_conf(char *name)
+const char *subsurface_get_conf(const char *name)
 {
 	CFPropertyListRef strpref;
 
diff --git a/windows.c b/windows.c
index 23b6d2f4c..94e3dc546 100644
--- a/windows.c
+++ b/windows.c
@@ -100,7 +100,7 @@ const char *subsurface_get_conf(const char *name)
 	return utf8_string;
 }
 
-int subsurface_get_conf_int(char *name)
+int subsurface_get_conf_int(const char *name)
 {
 	DWORD value = -1, len = 4;
 	LONG ret = RegQueryValueEx(hkey, (LPCTSTR)TEXT(name), NULL, NULL,
@@ -110,7 +110,7 @@ int subsurface_get_conf_int(char *name)
 	return value;
 }
 
-int subsurface_get_conf_bool(char *name)
+int subsurface_get_conf_bool(const char *name)
 {
 	int ret = subsurface_get_conf_int(name);
 	if (ret == -1)