diff --git a/fusee/fusee-primary/src/fs_utils.c b/fusee/fusee-primary/src/fs_utils.c
index da561a266..ff5a18bb5 100644
--- a/fusee/fusee-primary/src/fs_utils.c
+++ b/fusee/fusee-primary/src/fs_utils.c
@@ -22,7 +22,6 @@
 FATFS sd_fs;
 static bool g_sd_mounted = false;
 static bool g_sd_initialized = false;
-static bool g_ahb_redirect_enabled = false;
 sdmmc_t g_sd_sdmmc;
 sdmmc_device_t g_sd_device;
 
@@ -34,10 +33,7 @@ bool mount_sd(void)
         return true;
 
     /* Enable AHB redirection if necessary. */
-    if (!g_ahb_redirect_enabled) {
-        mc_enable_ahb_redirect();
-        g_ahb_redirect_enabled = true;
-    }
+    mc_acquire_ahb_redirect();
 
     if (!g_sd_initialized) {
         /* Initialize SD. */
@@ -68,10 +64,7 @@ void unmount_sd(void)
     }
 
     /* Disable AHB redirection if necessary. */
-    if (g_ahb_redirect_enabled) {
-        mc_disable_ahb_redirect();
-        g_ahb_redirect_enabled = false;
-    }
+    mc_release_ahb_redirect();
 }
 
 uint32_t get_file_size(const char *filename)
diff --git a/fusee/fusee-primary/src/mc.c b/fusee/fusee-primary/src/mc.c
index 35048d98e..b88cb1a5c 100644
--- a/fusee/fusee-primary/src/mc.c
+++ b/fusee/fusee-primary/src/mc.c
@@ -124,16 +124,21 @@ void mc_config_carveout_finalize()
     MAKE_MC_REG(MC_SECURITY_CARVEOUT2_CFG0) = 0x440167E;
 }
 
-void mc_enable_ahb_redirect()
+static int mc_ahb_redirect_users = 0;
+
+void mc_acquire_ahb_redirect()
 {
-    volatile tegra_car_t *car = car_get_regs();
-    car->lvl2_clk_gate_ovrd = ((car->lvl2_clk_gate_ovrd & 0xFFF7FFFF) | 0x80000);
+    if ((mc_ahb_redirect_users++) == 0)
+    {
+        volatile tegra_car_t *car = car_get_regs();
+        car->lvl2_clk_gate_ovrd = ((car->lvl2_clk_gate_ovrd & 0xFFF7FFFF) | 0x80000);
     
-    MAKE_MC_REG(MC_IRAM_BOM) = 0x40000000;
-    MAKE_MC_REG(MC_IRAM_TOM) = 0x4003F000;
+        MAKE_MC_REG(MC_IRAM_BOM) = 0x40000000;
+        MAKE_MC_REG(MC_IRAM_TOM) = 0x4003F000;
+    }
 }
 
-void mc_disable_ahb_redirect()
+static void mc_disable_ahb_redirect()
 {
     volatile tegra_car_t *car = car_get_regs();
     
@@ -141,6 +146,16 @@ void mc_disable_ahb_redirect()
     MAKE_MC_REG(MC_IRAM_TOM) = 0;
     
     car->lvl2_clk_gate_ovrd &= 0xFFF7FFFF;
+
+    mc_ahb_redirect_users = 0;
+}
+
+void mc_release_ahb_redirect()
+{
+    if ((--mc_ahb_redirect_users) == 0)
+    {
+        mc_disable_ahb_redirect();
+    }
 }
 
 void mc_enable()
@@ -166,4 +181,4 @@ void mc_enable()
     udelay(5);
 
     mc_disable_ahb_redirect();
-}
\ No newline at end of file
+}
diff --git a/fusee/fusee-primary/src/mc.h b/fusee/fusee-primary/src/mc.h
index 63a263a59..b1e2a2651 100644
--- a/fusee/fusee-primary/src/mc.h
+++ b/fusee/fusee-primary/src/mc.h
@@ -598,8 +598,8 @@ typedef enum {
 void mc_config_tsec_carveout(uint32_t bom, uint32_t size1mb, bool lock);
 void mc_config_carveout();
 void mc_config_carveout_finalize();
-void mc_enable_ahb_redirect();
-void mc_disable_ahb_redirect();
+void mc_acquire_ahb_redirect();
+void mc_release_ahb_redirect();
 void mc_enable();
 
 #endif
\ No newline at end of file