diff --git a/init/keychords_test.cpp b/init/keychords_test.cpp
index a3baeb1..33373d4 100644
--- a/init/keychords_test.cpp
+++ b/init/keychords_test.cpp
@@ -29,7 +29,6 @@
 #include <vector>
 
 #include <android-base/properties.h>
-#include <android-base/stringprintf.h>
 #include <android-base/strings.h>
 #include <gtest/gtest.h>
 
diff --git a/init/keyword_map.h b/init/keyword_map.h
index c95fc73..7837bb3 100644
--- a/init/keyword_map.h
+++ b/init/keyword_map.h
@@ -14,14 +14,11 @@
  * limitations under the License.
  */
 
-#ifndef _INIT_KEYWORD_MAP_H_
-#define _INIT_KEYWORD_MAP_H_
+#pragma once
 
 #include <map>
 #include <string>
 
-#include <android-base/stringprintf.h>
-
 #include "result.h"
 
 namespace android {
@@ -37,8 +34,6 @@
     }
 
     const Result<Function> FindFunction(const std::vector<std::string>& args) const {
-        using android::base::StringPrintf;
-
         if (args.empty()) return Error() << "Keyword needed, but not provided";
 
         auto& keyword = args[0];
@@ -46,7 +41,7 @@
 
         auto function_info_it = map().find(keyword);
         if (function_info_it == map().end()) {
-            return Error() << StringPrintf("Invalid keyword '%s'", keyword.c_str());
+            return Errorf("Invalid keyword '{}'", keyword);
         }
 
         auto function_info = function_info_it->second;
@@ -54,17 +49,17 @@
         auto min_args = std::get<0>(function_info);
         auto max_args = std::get<1>(function_info);
         if (min_args == max_args && num_args != min_args) {
-            return Error() << StringPrintf("%s requires %zu argument%s", keyword.c_str(), min_args,
-                                           (min_args > 1 || min_args == 0) ? "s" : "");
+            return Errorf("{} requires {} argument{}", keyword, min_args,
+                          (min_args > 1 || min_args == 0) ? "s" : "");
         }
 
         if (num_args < min_args || num_args > max_args) {
             if (max_args == std::numeric_limits<decltype(max_args)>::max()) {
-                return Error() << StringPrintf("%s requires at least %zu argument%s",
-                                               keyword.c_str(), min_args, min_args > 1 ? "s" : "");
+                return Errorf("{} requires at least {} argument{}", keyword, min_args,
+                              min_args > 1 ? "s" : "");
             } else {
-                return Error() << StringPrintf("%s requires between %zu and %zu arguments",
-                                               keyword.c_str(), min_args, max_args);
+                return Errorf("{} requires between {} and {} arguments", keyword, min_args,
+                              max_args);
             }
         }
 
@@ -79,5 +74,3 @@
 
 }  // namespace init
 }  // namespace android
-
-#endif
diff --git a/init/reboot.cpp b/init/reboot.cpp
index fbc03c2..eaba3cc 100644
--- a/init/reboot.cpp
+++ b/init/reboot.cpp
@@ -41,7 +41,6 @@
 #include <android-base/logging.h>
 #include <android-base/macros.h>
 #include <android-base/properties.h>
-#include <android-base/stringprintf.h>
 #include <android-base/strings.h>
 #include <android-base/unique_fd.h>
 #include <bootloader_message/bootloader_message.h>
@@ -62,7 +61,6 @@
 
 using android::base::GetBoolProperty;
 using android::base::Split;
-using android::base::StringPrintf;
 using android::base::Timer;
 using android::base::unique_fd;
 using android::base::WriteStringToFile;
diff --git a/init/result.h b/init/result.h
index 8c1f91e..b70dd1b 100644
--- a/init/result.h
+++ b/init/result.h
@@ -22,6 +22,8 @@
 #include <android-base/result.h>
 
 using android::base::ErrnoError;
+using android::base::ErrnoErrorf;
 using android::base::Error;
+using android::base::Errorf;
 using android::base::Result;
 using android::base::ResultError;
diff --git a/init/service.cpp b/init/service.cpp
index b6a7c33..4fe374c 100644
--- a/init/service.cpp
+++ b/init/service.cpp
@@ -332,12 +332,11 @@
         const std::string& arg = args[i];
         int res = LookupCap(arg);
         if (res < 0) {
-            return Error() << StringPrintf("invalid capability '%s'", arg.c_str());
+            return Errorf("invalid capability '{}'", arg);
         }
         unsigned int cap = static_cast<unsigned int>(res);  // |res| is >= 0.
         if (cap > last_valid_cap) {
-            return Error() << StringPrintf("capability '%s' not supported by the kernel",
-                                           arg.c_str());
+            return Errorf("capability '{}' not supported by the kernel", arg);
         }
         (*capabilities_)[cap] = true;
     }
@@ -402,8 +401,8 @@
     if (!ParseInt(args[1], &proc_attr_.priority,
                   static_cast<int>(ANDROID_PRIORITY_HIGHEST),  // highest is negative
                   static_cast<int>(ANDROID_PRIORITY_LOWEST))) {
-        return Error() << StringPrintf("process priority value must be range %d - %d",
-                                       ANDROID_PRIORITY_HIGHEST, ANDROID_PRIORITY_LOWEST);
+        return Errorf("process priority value must be range {} - {}", ANDROID_PRIORITY_HIGHEST,
+                      ANDROID_PRIORITY_LOWEST);
     }
     return {};
 }