diff --git a/CHANGELOG.md b/CHANGELOG.md
index 87988dc1..51e09b24 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - DAP: Use deep copies of dap configs.
+- DAP: Bad config validation: `dap.configuration.env` should be
+  a `table`, not a `string`.
 
 ## [4.7.4] - 2024-02-19
 
diff --git a/doc/rustaceanvim.txt b/doc/rustaceanvim.txt
index 011fa32f..f4797a7e 100644
--- a/doc/rustaceanvim.txt
+++ b/doc/rustaceanvim.txt
@@ -281,11 +281,17 @@ DapClientConfig                                                *DapClientConfig*
         {cwd?}           (string)                                                                         Current working directory
         {program?}       (string)                                                                         Path to executable for most DAP clients
         {args?}          (string[])                                                                       Optional args to DAP client, not valid for all client types
-        {env?}           (string)                                                                         Environmental variables
+        {env?}           (EnvironmentMap)                                                                 Environmental variables
         {initCommands?}  (string[])                                                                       Initial commands to run, `lldb` clients only
         {coreConfigs?}   (table)                                                                          Essential config values for `probe-rs` client, see https://probe.rs/docs/tools/debugger/
 
 
+EnvironmentMap                                                  *EnvironmentMap*
+
+    Type: ~
+        table<string,string[]>
+
+
 dap_config_request_launch                            *dap_config_request_launch*
 
     Type: ~
diff --git a/lua/rustaceanvim/config/check.lua b/lua/rustaceanvim/config/check.lua
index 464764f9..7bd2c367 100644
--- a/lua/rustaceanvim/config/check.lua
+++ b/lua/rustaceanvim/config/check.lua
@@ -146,7 +146,7 @@ function M.validate(cfg)
       cwd = { configuration.cwd, 'string', true },
       program = { configuration.program, 'string', true },
       args = { configuration.args, 'table', true },
-      env = { configuration.env, 'string', true },
+      env = { configuration.env, 'table', true },
       initCommands = { configuration.initCommands, 'string', true },
       coreConfigs = { configuration.coreConfigs, 'table', true },
     })
diff --git a/lua/rustaceanvim/config/init.lua b/lua/rustaceanvim/config/init.lua
index b1355abd..f344b064 100644
--- a/lua/rustaceanvim/config/init.lua
+++ b/lua/rustaceanvim/config/init.lua
@@ -145,10 +145,12 @@ vim.g.rustaceanvim = vim.g.rustaceanvim
 ---@field cwd? string Current working directory
 ---@field program? string Path to executable for most DAP clients
 ---@field args? string[] Optional args to DAP client, not valid for all client types
----@field env? string  Environmental variables
+---@field env? EnvironmentMap Environmental variables
 ---@field initCommands? string[] Initial commands to run, `lldb` clients only
 ---@field coreConfigs? table Essential config values for `probe-rs` client, see https://probe.rs/docs/tools/debugger/
 
+---@alias EnvironmentMap table<string, string[]>
+
 ---@alias dap_config_request_launch "launch"
 ---@alias dap_config_request_attach "attach"
 ---@alias dap_config_request_custom "custom"
diff --git a/lua/rustaceanvim/dap.lua b/lua/rustaceanvim/dap.lua
index fcc1d728..cc64f3f3 100644
--- a/lua/rustaceanvim/dap.lua
+++ b/lua/rustaceanvim/dap.lua
@@ -178,8 +178,6 @@ local function format_environment_variable(adapter, key, segments, sep)
   return adapter.type == 'server' and { [key] = value } or { key .. '=' .. value }
 end
 
----@alias EnvironmentMap {[string]: string[]}
-
 ---@type {[string]: EnvironmentMap}
 local environments = {}