diff --git a/include/modules/custom.hpp b/include/modules/custom.hpp
index c9992695..2c7ba8a8 100644
--- a/include/modules/custom.hpp
+++ b/include/modules/custom.hpp
@@ -14,7 +14,7 @@ namespace waybar::modules {
 
 class Custom : public ALabel {
  public:
-  Custom(const std::string&, const std::string&, const Json::Value&);
+  Custom(const std::string&, const std::string&, const Json::Value&, const std::string&);
   virtual ~Custom();
   auto update() -> void override;
   void refresh(int /*signal*/) override;
@@ -30,6 +30,7 @@ class Custom : public ALabel {
   bool handleToggle(GdkEventButton* const& e) override;
 
   const std::string name_;
+  const std::string output_name_;
   std::string text_;
   std::string id_;
   std::string alt_;
diff --git a/include/util/command.hpp b/include/util/command.hpp
index 0d729b77..4b9decaa 100644
--- a/include/util/command.hpp
+++ b/include/util/command.hpp
@@ -66,7 +66,7 @@ inline int close(FILE* fp, pid_t pid) {
   return stat;
 }
 
-inline FILE* open(const std::string& cmd, int& pid) {
+inline FILE* open(const std::string& cmd, int& pid, const std::string& output_name) {
   if (cmd == "") return nullptr;
   int fd[2];
   // Open the pipe with the close-on-exec flag set, so it will not be inherited
@@ -109,6 +109,9 @@ inline FILE* open(const std::string& cmd, int& pid) {
     ::close(fd[0]);
     dup2(fd[1], 1);
     setpgid(child_pid, child_pid);
+    if (output_name != "") {
+      setenv("WAYBAR_OUTPUT_NAME", output_name.c_str(), 1);
+    }
     execlp("/bin/sh", "sh", "-c", cmd.c_str(), (char*)0);
     exit(0);
   } else {
@@ -118,9 +121,9 @@ inline FILE* open(const std::string& cmd, int& pid) {
   return fdopen(fd[0], "r");
 }
 
-inline struct res exec(const std::string& cmd) {
+inline struct res exec(const std::string& cmd, const std::string& output_name) {
   int pid;
-  auto fp = command::open(cmd, pid);
+  auto fp = command::open(cmd, pid, output_name);
   if (!fp) return {-1, ""};
   auto output = command::read(fp);
   auto stat = command::close(fp, pid);
@@ -129,7 +132,7 @@ inline struct res exec(const std::string& cmd) {
 
 inline struct res execNoRead(const std::string& cmd) {
   int pid;
-  auto fp = command::open(cmd, pid);
+  auto fp = command::open(cmd, pid, "");
   if (!fp) return {-1, ""};
   auto stat = command::close(fp, pid);
   return {WEXITSTATUS(stat), ""};
diff --git a/src/factory.cpp b/src/factory.cpp
index ce5b925e..f3d7ebe6 100644
--- a/src/factory.cpp
+++ b/src/factory.cpp
@@ -205,7 +205,7 @@ waybar::AModule* waybar::Factory::makeModule(const std::string& name,
       return new waybar::modules::Temperature(id, config_[name]);
     }
     if (ref.compare(0, 7, "custom/") == 0 && ref.size() > 7) {
-      return new waybar::modules::Custom(ref.substr(7), id, config_[name]);
+      return new waybar::modules::Custom(ref.substr(7), id, config_[name], bar_.output->name);
     }
     if (ref.compare(0, 5, "cffi/") == 0 && ref.size() > 5) {
       return new waybar::modules::CFFI(ref.substr(5), id, config_[name]);
diff --git a/src/modules/custom.cpp b/src/modules/custom.cpp
index fa03c3be..6101f874 100644
--- a/src/modules/custom.cpp
+++ b/src/modules/custom.cpp
@@ -5,9 +5,10 @@
 #include "util/scope_guard.hpp"
 
 waybar::modules::Custom::Custom(const std::string& name, const std::string& id,
-                                const Json::Value& config)
+                                const Json::Value& config, const std::string& output_name)
     : ALabel(config, "custom-" + name, id, "{}"),
       name_(name),
+      output_name_(output_name),
       id_(id),
       percentage_(0),
       fp_(nullptr),
@@ -42,7 +43,7 @@ void waybar::modules::Custom::delayWorker() {
     }
     if (can_update) {
       if (config_["exec"].isString()) {
-        output_ = util::command::exec(config_["exec"].asString());
+        output_ = util::command::exec(config_["exec"].asString(), output_name_);
       }
       dp.emit();
     }
@@ -53,7 +54,7 @@ void waybar::modules::Custom::delayWorker() {
 void waybar::modules::Custom::continuousWorker() {
   auto cmd = config_["exec"].asString();
   pid_ = -1;
-  fp_ = util::command::open(cmd, pid_);
+  fp_ = util::command::open(cmd, pid_, output_name_);
   if (!fp_) {
     throw std::runtime_error("Unable to open " + cmd);
   }
@@ -79,7 +80,7 @@ void waybar::modules::Custom::continuousWorker() {
       if (config_["restart-interval"].isUInt()) {
         pid_ = -1;
         thread_.sleep_for(std::chrono::seconds(config_["restart-interval"].asUInt()));
-        fp_ = util::command::open(cmd, pid_);
+        fp_ = util::command::open(cmd, pid_, output_name_);
         if (!fp_) {
           throw std::runtime_error("Unable to open " + cmd);
         }
@@ -112,7 +113,7 @@ void waybar::modules::Custom::waitingWorker() {
     }
     if (can_update) {
       if (config_["exec"].isString()) {
-        output_ = util::command::exec(config_["exec"].asString());
+        output_ = util::command::exec(config_["exec"].asString(), output_name_);
       }
       dp.emit();
     }
diff --git a/src/modules/image.cpp b/src/modules/image.cpp
index 843cd954..08b03b92 100644
--- a/src/modules/image.cpp
+++ b/src/modules/image.cpp
@@ -45,7 +45,7 @@ auto waybar::modules::Image::update() -> void {
   if (config_["path"].isString()) {
     path_ = config_["path"].asString();
   } else if (config_["exec"].isString()) {
-    output_ = util::command::exec(config_["exec"].asString());
+    output_ = util::command::exec(config_["exec"].asString(), "");
     parseOutputRaw();
   } else {
     path_ = "";