diff --git a/CHANGELOG.md b/CHANGELOG.md
index 64bca0d..8155507 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [3.18.0] - 2024-04-02
+  - mabi generation to account for E extension
+
 ## [3.17.1] - 2024-02-25
   - add unratified Ssdbltrp, Smdbltrp, and Sddbltrp extensions
 
diff --git a/riscv_config/isa_validator.py b/riscv_config/isa_validator.py
index 26f097a..94f7412 100644
--- a/riscv_config/isa_validator.py
+++ b/riscv_config/isa_validator.py
@@ -235,6 +235,8 @@ def get_march_mabi (isa : str, opt_remove_custom_exts: bool = False):
 
     # mabi generation
     mabi = 'ilp32'
+    if 'E' in ext_list:
+      mabi += 'e'
     if 'F' in ext_list and 'D' in ext_list:
         mabi += 'd'
     elif 'F' in ext_list: