diff --git a/modules/programs/wezterm.nix b/modules/programs/wezterm.nix
index a9ef7cd7d..08f7dbfcc 100644
--- a/modules/programs/wezterm.nix
+++ b/modules/programs/wezterm.nix
@@ -7,6 +7,10 @@ let
   cfg = config.programs.wezterm;
   tomlFormat = pkgs.formats.toml { };
 
+  shellIntegrationStr = ''
+    source "${cfg.package}/etc/profile.d/wezterm.sh"
+  '';
+
 in {
   meta.maintainers = [ hm.maintainers.blmhemu ];
 
@@ -79,6 +83,13 @@ in {
       '';
     };
 
+    enableBashIntegration = mkEnableOption "WezTerm's Bash integration." // {
+      default = true;
+    };
+
+    enableZshIntegration = mkEnableOption "WezTerm's Zsh integration." // {
+      default = true;
+    };
   };
 
   config = mkIf cfg.enable {
@@ -99,5 +110,9 @@ in {
       nameValuePair "wezterm/colors/${name}.toml" {
         source = tomlFormat.generate "${name}.toml" { colors = value; };
       }) cfg.colorSchemes;
+
+    programs.bash.initExtra =
+      mkIf cfg.enableBashIntegration shellIntegrationStr;
+    programs.zsh.initExtra = mkIf cfg.enableZshIntegration shellIntegrationStr;
   };
 }
diff --git a/tests/modules/programs/wezterm/bash-integration-default.nix b/tests/modules/programs/wezterm/bash-integration-default.nix
new file mode 100644
index 000000000..84f34effb
--- /dev/null
+++ b/tests/modules/programs/wezterm/bash-integration-default.nix
@@ -0,0 +1,14 @@
+{ ... }:
+
+{
+  programs.bash.enable = true;
+
+  # Bash integration is enabled by default.
+  programs.wezterm.enable = true;
+
+  test.stubs.wezterm = { };
+
+  nmt.script = ''
+    assertFileContains home-files/.bashrc 'source "@wezterm@/etc/profile.d/wezterm.sh"'
+  '';
+}
diff --git a/tests/modules/programs/wezterm/bash-integration-disabled.nix b/tests/modules/programs/wezterm/bash-integration-disabled.nix
new file mode 100644
index 000000000..43c5f5fd9
--- /dev/null
+++ b/tests/modules/programs/wezterm/bash-integration-disabled.nix
@@ -0,0 +1,16 @@
+{ ... }:
+
+{
+  programs.bash.enable = true;
+
+  programs.wezterm = {
+    enable = true;
+    enableBashIntegration = false;
+  };
+
+  test.stubs.wezterm = { };
+
+  nmt.script = ''
+    assertFileNotRegex home-files/.bashrc 'source "@wezterm@/etc/profile.d/wezterm.sh"'
+  '';
+}
diff --git a/tests/modules/programs/wezterm/bash-integration-enabled.nix b/tests/modules/programs/wezterm/bash-integration-enabled.nix
new file mode 100644
index 000000000..007bc0d1a
--- /dev/null
+++ b/tests/modules/programs/wezterm/bash-integration-enabled.nix
@@ -0,0 +1,16 @@
+{ ... }:
+
+{
+  programs.bash.enable = true;
+
+  programs.wezterm = {
+    enable = true;
+    enableBashIntegration = true;
+  };
+
+  test.stubs.wezterm = { };
+
+  nmt.script = ''
+    assertFileContains home-files/.bashrc 'source "@wezterm@/etc/profile.d/wezterm.sh"'
+  '';
+}
diff --git a/tests/modules/programs/wezterm/default.nix b/tests/modules/programs/wezterm/default.nix
index 6a521c9c4..0ed73acb4 100644
--- a/tests/modules/programs/wezterm/default.nix
+++ b/tests/modules/programs/wezterm/default.nix
@@ -1,4 +1,12 @@
 {
   wezterm-example-setting = ./example-setting.nix;
   wezterm-empty-setting = ./empty-setting.nix;
+
+  wezterm-bash-integration-default = ./bash-integration-default.nix;
+  wezterm-bash-integration-disabled = ./bash-integration-disabled.nix;
+  wezterm-bash-integration-enabled = ./bash-integration-enabled.nix;
+
+  wezterm-zsh-integration-default = ./zsh-integration-default.nix;
+  wezterm-zsh-integration-disabled = ./zsh-integration-disabled.nix;
+  wezterm-zsh-integration-enabled = ./zsh-integration-enabled.nix;
 }
diff --git a/tests/modules/programs/wezterm/zsh-integration-default.nix b/tests/modules/programs/wezterm/zsh-integration-default.nix
new file mode 100644
index 000000000..cc398c9d9
--- /dev/null
+++ b/tests/modules/programs/wezterm/zsh-integration-default.nix
@@ -0,0 +1,15 @@
+{ ... }:
+
+{
+  programs.zsh.enable = true;
+
+  # Zsh integration is enabled by default.
+  programs.wezterm.enable = true;
+
+  test.stubs.wezterm = { };
+  test.stubs.zsh = { };
+
+  nmt.script = ''
+    assertFileContains home-files/.zshrc 'source "@wezterm@/etc/profile.d/wezterm.sh"'
+  '';
+}
diff --git a/tests/modules/programs/wezterm/zsh-integration-disabled.nix b/tests/modules/programs/wezterm/zsh-integration-disabled.nix
new file mode 100644
index 000000000..fe7375245
--- /dev/null
+++ b/tests/modules/programs/wezterm/zsh-integration-disabled.nix
@@ -0,0 +1,17 @@
+{ ... }:
+
+{
+  programs.zsh.enable = true;
+
+  programs.wezterm = {
+    enable = true;
+    enableZshIntegration = false;
+  };
+
+  test.stubs.wezterm = { };
+  test.stubs.zsh = { };
+
+  nmt.script = ''
+    assertFileNotRegex home-files/.zshrc 'source "@wezterm@/etc/profile.d/wezterm.sh"'
+  '';
+}
diff --git a/tests/modules/programs/wezterm/zsh-integration-enabled.nix b/tests/modules/programs/wezterm/zsh-integration-enabled.nix
new file mode 100644
index 000000000..4e0928709
--- /dev/null
+++ b/tests/modules/programs/wezterm/zsh-integration-enabled.nix
@@ -0,0 +1,17 @@
+{ ... }:
+
+{
+  programs.zsh.enable = true;
+
+  programs.wezterm = {
+    enable = true;
+    enableZshIntegration = true;
+  };
+
+  test.stubs.wezterm = { };
+  test.stubs.zsh = { };
+
+  nmt.script = ''
+    assertFileContains home-files/.zshrc 'source "@wezterm@/etc/profile.d/wezterm.sh"'
+  '';
+}