diff --git a/sys/denali/ahci/ahci_driver.cpp b/sys/denali/ahci/ahci_driver.cpp
index 1b9f72a..7c29288 100644
--- a/sys/denali/ahci/ahci_driver.cpp
+++ b/sys/denali/ahci/ahci_driver.cpp
@@ -119,7 +119,7 @@ void AhciDriver::DumpCapabilities() {
     dbgln("Aggressive device sleep management");
   }
 
-  dbgln("Control %x", ahci_hba_->global_host_control);
+  dbgln("Control {x}", ahci_hba_->global_host_control);
 }
 
 void AhciDriver::DumpPorts() {
diff --git a/sys/denali/lib/denali/denali.yunq.server.cpp b/sys/denali/lib/denali/denali.yunq.server.cpp
index 7411bac..bd61464 100644
--- a/sys/denali/lib/denali/denali.yunq.server.cpp
+++ b/sys/denali/lib/denali/denali.yunq.server.cpp
@@ -52,7 +52,7 @@ void DenaliServerBase::ServerThread() {
     recv_cap.Reset();
     glcr::ErrorCode recv_err = static_cast<glcr::ErrorCode>(ZEndpointRecv(endpoint_, &recv_buf_size, recv_buffer.RawPtr(), &recv_cap_size, recv_cap.RawPtr(), &reply_port_cap));
     if (recv_err != glcr::OK) {
-      dbgln("Error in receive: %x", recv_err);
+      dbgln("Error in receive: {x}", recv_err);
       continue;
     }
 
@@ -69,7 +69,7 @@ void DenaliServerBase::ServerThread() {
       reply_err = static_cast<glcr::ErrorCode>(ZReplyPortSend(reply_port_cap, kHeaderSize + resp_length, resp_buffer.RawPtr(), resp_cap.UsedSlots(), resp_cap.RawPtr()));
     }
     if (reply_err != glcr::OK) {
-      dbgln("Error in reply: %x", reply_err);
+      dbgln("Error in reply: {x}", reply_err);
     }
   }
 
diff --git a/sys/victoriafalls/fs/ext2/ext2_driver.cpp b/sys/victoriafalls/fs/ext2/ext2_driver.cpp
index ff8de3a..c6ada4f 100644
--- a/sys/victoriafalls/fs/ext2/ext2_driver.cpp
+++ b/sys/victoriafalls/fs/ext2/ext2_driver.cpp
@@ -20,22 +20,22 @@ glcr::ErrorOr<Ext2Driver> Ext2Driver::Init(ScopedDenaliClient&& denali) {
 glcr::ErrorCode Ext2Driver::ProbePartition() {
   Superblock* superblock = ext2_reader_->GetSuperblock();
   if (superblock->magic != 0xEF53) {
-    dbgln("Invalid EXT2 magic code: %x");
+    dbgln("Invalid EXT2 magic code: {x}");
     return glcr::INVALID_ARGUMENT;
   }
-  dbgln("Block size: 0x%x", 1024 << superblock->log_block_size);
+  dbgln("Block size: 0x{x}", 1024 << superblock->log_block_size);
 
-  dbgln("Blocks: 0x%x (0x%x per group)", superblock->blocks_count,
+  dbgln("Blocks: 0x{x} (0x{x} per group)", superblock->blocks_count,
         superblock->blocks_per_group);
-  dbgln("Inodes: 0x%x (0x%x per group)", superblock->inodes_count,
+  dbgln("Inodes: 0x{x} (0x{x} per group)", superblock->inodes_count,
         superblock->inodes_per_group);
-  dbgln("Inode size: 0x%x", superblock->inode_size);
+  dbgln("Inode size: 0x{x}", superblock->inode_size);
 
-  dbgln("Mounts: 0x%x out of 0x%x", superblock->mnt_count,
+  dbgln("Mounts: 0x{x} out of 0x{x}", superblock->mnt_count,
         superblock->max_mnt_count);
-  dbgln("State: %x", superblock->state);
+  dbgln("State: {x}", superblock->state);
 
-  dbgln("Created by: %x", superblock->creator_os);
+  dbgln("Created by: {x}", superblock->creator_os);
 
   return glcr::OK;
 }
diff --git a/sys/victoriafalls/lib/victoriafalls/victoriafalls.yunq.server.cpp b/sys/victoriafalls/lib/victoriafalls/victoriafalls.yunq.server.cpp
index 65d36fd..19ca931 100644
--- a/sys/victoriafalls/lib/victoriafalls/victoriafalls.yunq.server.cpp
+++ b/sys/victoriafalls/lib/victoriafalls/victoriafalls.yunq.server.cpp
@@ -52,7 +52,7 @@ void VFSServerBase::ServerThread() {
     recv_cap.Reset();
     glcr::ErrorCode recv_err = static_cast<glcr::ErrorCode>(ZEndpointRecv(endpoint_, &recv_buf_size, recv_buffer.RawPtr(), &recv_cap_size, recv_cap.RawPtr(), &reply_port_cap));
     if (recv_err != glcr::OK) {
-      dbgln("Error in receive: %x", recv_err);
+      dbgln("Error in receive: {x}", recv_err);
       continue;
     }
 
@@ -69,7 +69,7 @@ void VFSServerBase::ServerThread() {
       reply_err = static_cast<glcr::ErrorCode>(ZReplyPortSend(reply_port_cap, kHeaderSize + resp_length, resp_buffer.RawPtr(), resp_cap.UsedSlots(), resp_cap.RawPtr()));
     }
     if (reply_err != glcr::OK) {
-      dbgln("Error in reply: %x", reply_err);
+      dbgln("Error in reply: {x}", reply_err);
     }
   }
 
diff --git a/sys/yellowstone/lib/yellowstone/yellowstone.yunq.server.cpp b/sys/yellowstone/lib/yellowstone/yellowstone.yunq.server.cpp
index f2e695b..3f9bda7 100644
--- a/sys/yellowstone/lib/yellowstone/yellowstone.yunq.server.cpp
+++ b/sys/yellowstone/lib/yellowstone/yellowstone.yunq.server.cpp
@@ -52,7 +52,7 @@ void YellowstoneServerBase::ServerThread() {
     recv_cap.Reset();
     glcr::ErrorCode recv_err = static_cast<glcr::ErrorCode>(ZEndpointRecv(endpoint_, &recv_buf_size, recv_buffer.RawPtr(), &recv_cap_size, recv_cap.RawPtr(), &reply_port_cap));
     if (recv_err != glcr::OK) {
-      dbgln("Error in receive: %x", recv_err);
+      dbgln("Error in receive: {x}", recv_err);
       continue;
     }
 
@@ -69,7 +69,7 @@ void YellowstoneServerBase::ServerThread() {
       reply_err = static_cast<glcr::ErrorCode>(ZReplyPortSend(reply_port_cap, kHeaderSize + resp_length, resp_buffer.RawPtr(), resp_cap.UsedSlots(), resp_cap.RawPtr()));
     }
     if (reply_err != glcr::OK) {
-      dbgln("Error in reply: %x", reply_err);
+      dbgln("Error in reply: {x}", reply_err);
     }
   }