diff --git a/CHANGELOG.md b/CHANGELOG.md
index ea005b7..d347b84 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,9 @@
 # Changelog
 _Change is the essence._
 
+## 1.1.3
+* Add box-sizing property to Columnizer mixin.
+
 ## 1.1.2
 * Uptade for security vulnerabilities.
 
diff --git a/package.json b/package.json
index 745bc75..8eb9766 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
   "author": "Halil İbrahim Çakıroğlu",
   "main": "scss/_gerillass.scss",
   "license": "Apache-2.0",
-  "version": "1.1.2",
+  "version": "1.1.3",
   "repository": {
     "type": "git",
     "url": "https://github.com/selfishprimate/gerillass"
diff --git a/scss/_gerillass-prefix.scss b/scss/_gerillass-prefix.scss
index 93350a7..d9ff24d 100644
--- a/scss/_gerillass-prefix.scss
+++ b/scss/_gerillass-prefix.scss
@@ -533,6 +533,7 @@
   $fill: false;
   display: flex;
   flex-wrap: wrap;
+  @include border-box;
   > * {
     @if length($params) == 1 {
       flex: 0 0 calc(100% / #{$columns});
diff --git a/scss/library/_columnizer.scss b/scss/library/_columnizer.scss
index 941e45a..c292f51 100644
--- a/scss/library/_columnizer.scss
+++ b/scss/library/_columnizer.scss
@@ -6,6 +6,7 @@
   $fill: false;
   display: flex;
   flex-wrap: wrap;
+  @include border-box;
   > * {
     @if length($params) == 1 {
       flex: 0 0 calc(100% / #{$columns});