diff --git a/apex_driver.c b/apex_driver.c
index 9aa8408..617841f 100644
--- a/apex_driver.c
+++ b/apex_driver.c
@@ -138,9 +138,6 @@ static const struct gasket_mappable_region mappable_regions[NUM_REGIONS] = {
 	{ 0x48000, 0x1000 },
 };
 
-static const struct gasket_mappable_region cm_mappable_regions[1] = { { 0x0,
-	APEX_CH_MEM_BYTES } };
-
 /* Gasket device interrupts enums must be dense (i.e., no empty slots). */
 enum apex_interrupt {
 	APEX_INTERRUPT_INSTR_QUEUE = 0,