diff --git a/macosx-10.10.json b/macosx-10.10.json
index 632ef82a4..d9317e512 100644
--- a/macosx-10.10.json
+++ b/macosx-10.10.json
@@ -2,7 +2,7 @@
   "builders": [
     {
       "boot_wait": "2s",
-      "disk_size": 20480,
+      "disk_size": 40960,
       "guest_os_type": "darwin12-64",
       "headless": "{{ user `headless` }}",
       "iso_checksum": "{{user `iso_checksum`}}",
@@ -34,7 +34,7 @@
     },
     {
       "boot_wait": "2s",
-      "disk_size": 20480,
+      "disk_size": 40960,
       "guest_additions_mode": "disable",
       "guest_os_type": "MacOS109_64",
       "hard_drive_interface": "sata",
diff --git a/macosx-10.7.json b/macosx-10.7.json
index e3d4a1286..a2d24cf7f 100644
--- a/macosx-10.7.json
+++ b/macosx-10.7.json
@@ -2,7 +2,7 @@
   "builders": [
     {
       "boot_wait": "2s",
-      "disk_size": 20480,
+      "disk_size": 40960,
       "guest_os_type": "darwin12-64",
       "headless": "{{ user `headless` }}",
       "iso_checksum": "{{user `iso_checksum`}}",
@@ -34,7 +34,7 @@
     },
     {
       "boot_wait": "2s",
-      "disk_size": 20480,
+      "disk_size": 40960,
       "guest_additions_mode": "disable",
       "guest_os_type": "MacOS107_64",
       "hard_drive_interface": "sata",
diff --git a/macosx-10.8.json b/macosx-10.8.json
index 0efd8d973..ca3088cb1 100644
--- a/macosx-10.8.json
+++ b/macosx-10.8.json
@@ -2,7 +2,7 @@
   "builders": [
     {
       "boot_wait": "2s",
-      "disk_size": 20480,
+      "disk_size": 40960,
       "guest_os_type": "darwin12-64",
       "headless": "{{ user `headless` }}",
       "iso_checksum": "{{user `iso_checksum`}}",
@@ -34,7 +34,7 @@
     },
     {
       "boot_wait": "2s",
-      "disk_size": 20480,
+      "disk_size": 40960,
       "guest_additions_mode": "disable",
       "guest_os_type": "MacOS108_64",
       "hard_drive_interface": "sata",
diff --git a/macosx-10.9.json b/macosx-10.9.json
index 990b5fd20..833dcfe08 100644
--- a/macosx-10.9.json
+++ b/macosx-10.9.json
@@ -2,7 +2,7 @@
   "builders": [
     {
       "boot_wait": "2s",
-      "disk_size": 20480,
+      "disk_size": 40960,
       "guest_os_type": "darwin12-64",
       "headless": "{{ user `headless` }}",
       "iso_checksum": "{{user `iso_checksum`}}",
@@ -34,7 +34,7 @@
     },
     {
       "boot_wait": "2s",
-      "disk_size": 20480,
+      "disk_size": 40960,
       "guest_additions_mode": "disable",
       "guest_os_type": "MacOS109_64",
       "hard_drive_interface": "sata",