diff --git a/src/core/file_sys/archive_extsavedata.cpp b/src/core/file_sys/archive_extsavedata.cpp
index 830a363e2..48dae3e8f 100644
--- a/src/core/file_sys/archive_extsavedata.cpp
+++ b/src/core/file_sys/archive_extsavedata.cpp
@@ -166,15 +166,14 @@ std::string GetExtSaveDataPath(const std::string& mount_point, const Path& path)
     ExtSaveDataArchivePath path_data;
     std::memcpy(&path_data, vec_data.data(), sizeof(path_data));
 
-    return fmt::format("{}{:08x}/{:08x}/", mount_point.c_str(), path_data.save_high,
-                       path_data.save_low);
+    return fmt::format("{}{:08X}/{:08X}/", mount_point, path_data.save_high, path_data.save_low);
 }
 
 std::string GetExtDataContainerPath(const std::string& mount_point, bool shared) {
     if (shared)
-        return fmt::format("{}data/{}/extdata/", mount_point.c_str(), SYSTEM_ID);
+        return fmt::format("{}data/{}/extdata/", mount_point, SYSTEM_ID);
 
-    return fmt::format("{}Nintendo 3DS/{}/{}/extdata/", mount_point.c_str(), SYSTEM_ID, SDCARD_ID);
+    return fmt::format("{}Nintendo 3DS/{}/{}/extdata/", mount_point, SYSTEM_ID, SDCARD_ID);
 }
 
 Path ConstructExtDataBinaryPath(u32 media_type, u32 high, u32 low) {
diff --git a/src/core/file_sys/archive_source_sd_savedata.cpp b/src/core/file_sys/archive_source_sd_savedata.cpp
index b7fb549ff..b9e8895bb 100644
--- a/src/core/file_sys/archive_source_sd_savedata.cpp
+++ b/src/core/file_sys/archive_source_sd_savedata.cpp
@@ -19,19 +19,19 @@ namespace FileSys {
 namespace {
 
 std::string GetSaveDataContainerPath(const std::string& sdmc_directory) {
-    return fmt::format("{}Nintendo 3DS/{}/{}/title/", sdmc_directory.c_str(), SYSTEM_ID, SDCARD_ID);
+    return fmt::format("{}Nintendo 3DS/{}/{}/title/", sdmc_directory, SYSTEM_ID, SDCARD_ID);
 }
 
 std::string GetSaveDataPath(const std::string& mount_location, u64 program_id) {
     u32 high = static_cast<u32>(program_id >> 32);
     u32 low = static_cast<u32>(program_id & 0xFFFFFFFF);
-    return fmt::format("{}{:08x}/{:08x}/data/00000001/", mount_location.c_str(), high, low);
+    return fmt::format("{}{:08x}/{:08x}/data/00000001/", mount_location, high, low);
 }
 
 std::string GetSaveDataMetadataPath(const std::string& mount_location, u64 program_id) {
     u32 high = static_cast<u32>(program_id >> 32);
     u32 low = static_cast<u32>(program_id & 0xFFFFFFFF);
-    return fmt::format("{}{:08x}/{:08x}/data/00000001.metadata", mount_location.c_str(), high, low);
+    return fmt::format("{}{:08x}/{:08x}/data/00000001.metadata", mount_location, high, low);
 }
 
 } // namespace
diff --git a/src/core/file_sys/archive_systemsavedata.cpp b/src/core/file_sys/archive_systemsavedata.cpp
index 322e98fa4..1e6a41166 100644
--- a/src/core/file_sys/archive_systemsavedata.cpp
+++ b/src/core/file_sys/archive_systemsavedata.cpp
@@ -26,11 +26,11 @@ std::string GetSystemSaveDataPath(const std::string& mount_point, const Path& pa
     u32 save_high;
     std::memcpy(&save_low, &vec_data[4], sizeof(u32));
     std::memcpy(&save_high, &vec_data[0], sizeof(u32));
-    return fmt::format("{}{:08X}/{:08X}/", mount_point.c_str(), save_low, save_high);
+    return fmt::format("{}{:08X}/{:08X}/", mount_point, save_low, save_high);
 }
 
 std::string GetSystemSaveDataContainerPath(const std::string& mount_point) {
-    return fmt::format("{}data/{}/sysdata/", mount_point.c_str(), SYSTEM_ID);
+    return fmt::format("{}data/{}/sysdata/", mount_point, SYSTEM_ID);
 }
 
 Path ConstructSystemSaveDataBinaryPath(u32 high, u32 low) {
diff --git a/src/core/hle/kernel/svc.cpp b/src/core/hle/kernel/svc.cpp
index 3da279cea..c07e09b9a 100644
--- a/src/core/hle/kernel/svc.cpp
+++ b/src/core/hle/kernel/svc.cpp
@@ -724,7 +724,7 @@ static ResultCode GetResourceLimitLimitValues(VAddr values, Handle resource_limi
 /// Creates a new thread
 static ResultCode CreateThread(Handle* out_handle, u32 priority, u32 entry_point, u32 arg,
                                u32 stack_top, s32 processor_id) {
-    std::string name = fmt::format("unknown-{:08X}" PRIX32, entry_point);
+    std::string name = fmt::format("unknown-{:08X}", entry_point);
 
     if (priority > THREADPRIO_LOWEST) {
         return ERR_OUT_OF_RANGE;
diff --git a/src/core/hle/service/am/am.cpp b/src/core/hle/service/am/am.cpp
index d6db9ae6a..beafb6e48 100644
--- a/src/core/hle/service/am/am.cpp
+++ b/src/core/hle/service/am/am.cpp
@@ -418,7 +418,7 @@ std::string GetTitleContentPath(Service::FS::MediaType media_type, u64 tid, u16
         }
     }
 
-    return fmt::format("{}{:08x}.app", content_path.c_str(), content_id);
+    return fmt::format("{}{:08x}.app", content_path, content_id);
 }
 
 std::string GetTitlePath(Service::FS::MediaType media_type, u64 tid) {
@@ -426,7 +426,7 @@ std::string GetTitlePath(Service::FS::MediaType media_type, u64 tid) {
     u32 low = static_cast<u32>(tid & 0xFFFFFFFF);
 
     if (media_type == Service::FS::MediaType::NAND || media_type == Service::FS::MediaType::SDMC)
-        return fmt::format("{}{:08x}/{:08x}/", GetMediaTitlePath(media_type).c_str(), high, low);
+        return fmt::format("{}{:08x}/{:08x}/", GetMediaTitlePath(media_type), high, low);
 
     if (media_type == Service::FS::MediaType::GameCard) {
         // TODO(shinyquagsire23): get current app path if TID matches?
@@ -439,10 +439,10 @@ std::string GetTitlePath(Service::FS::MediaType media_type, u64 tid) {
 
 std::string GetMediaTitlePath(Service::FS::MediaType media_type) {
     if (media_type == Service::FS::MediaType::NAND)
-        return fmt::format("{}{}/title/", FileUtil::GetUserPath(D_NAND_IDX).c_str(), SYSTEM_ID);
+        return fmt::format("{}{}/title/", FileUtil::GetUserPath(D_NAND_IDX), SYSTEM_ID);
 
     if (media_type == Service::FS::MediaType::SDMC)
-        return fmt::format("{}Nintendo 3DS/{}/{}/title/", FileUtil::GetUserPath(D_SDMC_IDX).c_str(),
+        return fmt::format("{}Nintendo 3DS/{}/{}/title/", FileUtil::GetUserPath(D_SDMC_IDX),
                            SYSTEM_ID, SDCARD_ID);
 
     if (media_type == Service::FS::MediaType::GameCard) {