diff --git a/dia2code/dia2code/dia2code.c b/dia2code/dia2code/dia2code.c

index 2ef5b7d..e29ef33 100644

--- a/dia2code/dia2code/dia2code.c

+++ b/dia2code/dia2code/dia2code.c

@@ -744,6 +744,7 @@ int d2c_backup(char *filename)

 */

 int indent_count = 4;

 int indent_open_brace_on_newline = 1;

+int generate_backup;

 typedef struct

diff --git a/dia2code/dia2code/dia2code.h b/dia2code/dia2code/dia2code.h

index 3acab47..bdd62c6 100644

--- a/dia2code/dia2code/dia2code.h

+++ b/dia2code/dia2code/dia2code.h

@@ -305,8 +305,8 @@ param_list * d2c_parameter_set(char *name, char *value);

 char * d2c_parameter_value(char *name);

 param_list *d2c_parameter_find(char *name);

-int indent_count;

-int indent_open_brace_on_newline;

-int generate_backup;

+extern int indent_count;

+extern int indent_open_brace_on_newline;

+extern int generate_backup;

 #endif