diff --git a/src/company_gui.cpp b/src/company_gui.cpp
--- a/src/company_gui.cpp
+++ b/src/company_gui.cpp
@@ -34,12 +34,10 @@
 #include "table/strings.h"
 
 /** Company GUI constants. */
-enum {
-	FIRST_GUI_CALL = INT_MAX,  ///< default value to specify this is the first call of the resizable gui
+static const int FIRST_GUI_CALL = INT_MAX; ///< default value to specify this is the first call of the resizable gui
 
-	EXP_LINESPACE  = 2,        ///< Amount of vertical space for a horizontal (sub-)total line.
-	EXP_BLOCKSPACE = 10,       ///< Amount of vertical space between two blocks of numbers.
-};
+static const uint EXP_LINESPACE  = 2;      ///< Amount of vertical space for a horizontal (sub-)total line.
+static const uint EXP_BLOCKSPACE = 10;     ///< Amount of vertical space between two blocks of numbers.
 
 static void DoSelectCompanyManagerFace(Window *parent);