diff --git a/README.md b/README.md
index d6c2ad9..c4632df 100644
--- a/README.md
+++ b/README.md
@@ -305,7 +305,10 @@ Default:
 ```json
 [
   {
-    "self": true
+    "from_port": 0,
+    "protocol": -1,
+    "self": true,
+    "to_port": 0
   }
 ]
 ```
@@ -321,7 +324,10 @@ Default:
 ```json
 [
   {
-    "self": true
+    "from_port": 0,
+    "protocol": "-1",
+    "self": true,
+    "to_port": 0
   }
 ]
 ```
diff --git a/variables.tf b/variables.tf
index 06d33da..5776e1a 100644
--- a/variables.tf
+++ b/variables.tf
@@ -179,7 +179,10 @@ variable "default_security_group_ingress" {
   description = "List of maps of ingress rules to set on the default security group"
   type        = list(map(string))
   default = [{
-    self = true
+    protocol  = -1
+    self      = true
+    from_port = 0
+    to_port   = 0
   }]
 }
 
@@ -187,6 +190,9 @@ variable "default_security_group_egress" {
   description = "List of maps of egress rules to set on the default security group"
   type        = list(map(string))
   default = [{
-    self = true
+    protocol  = "-1"
+    self      = true
+    from_port = 0
+    to_port   = 0
   }]
 }