diff --git a/ModelicaCompliance/Resources/Include/ExtObj.c b/ModelicaCompliance/Resources/Include/ExtObj.c
index 8213a76..60daaac 100644
--- a/ModelicaCompliance/Resources/Include/ExtObj.c
+++ b/ModelicaCompliance/Resources/Include/ExtObj.c
@@ -10,6 +10,7 @@
 #include "ExtObj.h"
 
 /* Constructor for MyTable. */
+static
 void* initMyTable(double *table_data, size_t table_size)
 {
   MyTable *table = (MyTable*)malloc(sizeof(MyTable));
@@ -25,7 +26,7 @@ void* initMyTable(double *table_data, size_t table_size)
     free(table);
     ModelicaError("Error allocating array in MyTable.\n");
     return 0; /* Not reachable */
-  } 
+  }
 
   memcpy(table->array, table_data, table_size * sizeof(double));
   table->size = table_size;
@@ -34,15 +35,17 @@ void* initMyTable(double *table_data, size_t table_size)
 }
 
 /* Destructor for MyTable. */
+static
 void closeMyTable(void *object)
 {
   MyTable *table = (MyTable*)object;
   if (object == NULL) return;
   free(table->array);
   free(table);
-} 
+}
 
 /* Interpolates between two adjacent values in the table. */
+static
 double interpolateMyTable(void *object, double u)
 {
   MyTable *table = (MyTable*)object;
diff --git a/ModelicaCompliance/Resources/Include/ExtObj.h b/ModelicaCompliance/Resources/Include/ExtObj.h
index b8df772..e35729b 100644
--- a/ModelicaCompliance/Resources/Include/ExtObj.h
+++ b/ModelicaCompliance/Resources/Include/ExtObj.h
@@ -6,8 +6,8 @@ typedef struct {
   unsigned size;
 } MyTable;
 
-void* initMyTable(double *table_data, size_t table_size);
-void closeMyTable(void* object);
-double interpolateMyTable(void* object, double u);
+static void* initMyTable(double *table_data, size_t table_size);
+static void closeMyTable(void* object);
+static double interpolateMyTable(void* object, double u);
 
 #endif /*EXTOBJ_H*/