diff --git a/xpcom/base/Logging.cpp b/xpcom/base/Logging.cpp
index 6d03f40278a3..fb7adec9c849 100644
--- a/xpcom/base/Logging.cpp
+++ b/xpcom/base/Logging.cpp
@@ -44,18 +44,6 @@ namespace mozilla {
 
 namespace detail {
 
-void log_print(const PRLogModuleInfo* aModule,
-               LogLevel aLevel,
-               const char* aFmt, ...)
-{
-  va_list ap;
-  va_start(ap, aFmt);
-  char* buff = mozilla::Vsmprintf(aFmt, ap);
-  PR_LogPrint("%s", buff);
-  mozilla::SmprintfFree(buff);
-  va_end(ap);
-}
-
 void log_print(const LogModule* aModule,
                LogLevel aLevel,
                const char* aFmt, ...)
diff --git a/xpcom/base/Logging.h b/xpcom/base/Logging.h
index 335517610865..55437b41b49e 100644
--- a/xpcom/base/Logging.h
+++ b/xpcom/base/Logging.h
@@ -10,18 +10,10 @@
 #include <string.h>
 #include <stdarg.h>
 
-#include "prlog.h"
-
 #include "mozilla/Assertions.h"
 #include "mozilla/Atomics.h"
 #include "mozilla/Attributes.h"
 #include "mozilla/Likely.h"
-#include "mozilla/MacroForEach.h"
-
-// This file is a placeholder for a replacement to the NSPR logging framework
-// that is defined in prlog.h. Currently it is just a pass through, but as
-// work progresses more functionality will be swapped out in favor of
-// mozilla logging implementations.
 
 // We normally have logging enabled everywhere, but measurements showed that
 // having logging enabled on Android is quite expensive (hundreds of kilobytes
@@ -192,20 +184,6 @@ private:
 
 namespace detail {
 
-inline bool log_test(const PRLogModuleInfo* module, LogLevel level) {
-  MOZ_ASSERT(level != LogLevel::Disabled);
-  return module && module->level >= static_cast<int>(level);
-}
-
-/**
- * A rather inefficient wrapper for PR_LogPrint that always allocates.
- * PR_LogModuleInfo is deprecated so it's not worth the effort to do
- * any better.
- */
-void log_print(const PRLogModuleInfo* aModule,
-                      LogLevel aLevel,
-                      const char* aFmt, ...) MOZ_FORMAT_PRINTF(3, 4);
-
 inline bool log_test(const LogModule* module, LogLevel level) {
   MOZ_ASSERT(level != LogLevel::Disabled);
   return module && module->ShouldLog(level);
@@ -239,15 +217,12 @@ void log_print(const LogModule* aModule,
 #define MOZ_LOG_TEST(_module,_level) false
 #endif
 
-#define MOZ_LOG(_module,_level,_args)     \
-  PR_BEGIN_MACRO             \
-    if (MOZ_LOG_TEST(_module,_level)) { \
-      mozilla::detail::log_print(_module, _level, MOZ_LOG_EXPAND_ARGS _args);         \
-    }                     \
-  PR_END_MACRO
-
-#undef PR_LOG
-#undef PR_LOG_TEST
+#define MOZ_LOG(_module,_level,_args)                                         \
+  do {                                                                        \
+    if (MOZ_LOG_TEST(_module,_level)) {                                       \
+      mozilla::detail::log_print(_module, _level, MOZ_LOG_EXPAND_ARGS _args); \
+    }                                                                         \
+  } while (0)
 
 // This #define is a Logging.h-only knob!  Don't encourage people to get fancy
 // with their log definitions by exporting it outside of Logging.h.