diff --git a/Userland/Libraries/LibCore/IODevice.cpp b/Userland/Libraries/LibCore/IODevice.cpp
index 453526e408..58f29ed057 100644
--- a/Userland/Libraries/LibCore/IODevice.cpp
+++ b/Userland/Libraries/LibCore/IODevice.cpp
@@ -184,7 +184,7 @@ String IODevice::read_line(size_t max_size)
         return {};
     if (m_eof) {
         if (m_buffered_data.size() > max_size) {
-            dbgprintf("IODevice::read_line: At EOF but there's more than max_size(%zu) buffered\n", max_size);
+            dbgln("IODevice::read_line: At EOF but there's more than max_size({}) buffered", max_size);
             return {};
         }
         auto line = String((const char*)m_buffered_data.data(), m_buffered_data.size(), Chomp);
diff --git a/Userland/Libraries/LibCore/NetworkJob.cpp b/Userland/Libraries/LibCore/NetworkJob.cpp
index 46d91a1a7a..a2884d5a54 100644
--- a/Userland/Libraries/LibCore/NetworkJob.cpp
+++ b/Userland/Libraries/LibCore/NetworkJob.cpp
@@ -27,7 +27,6 @@
 #include <AK/Debug.h>
 #include <LibCore/NetworkJob.h>
 #include <LibCore/NetworkResponse.h>
-#include <stdio.h>
 
 namespace Core {
 
@@ -68,9 +67,7 @@ void NetworkJob::did_fail(Error error)
     NonnullRefPtr<NetworkJob> protector(*this);
 
     m_error = error;
-#if CNETWORKJOB_DEBUG
-    dbgprintf("%s{%p} job did_fail! error: %u (%s)\n", class_name(), this, (unsigned)error, to_string(error));
-#endif
+    dbgln_if(CNETWORKJOB_DEBUG, "{}{{{:p}}} job did_fail! error: {} ({})", class_name(), this, (unsigned)error, to_string(error));
     ASSERT(on_finish);
     on_finish(false);
     shutdown();