diff --git a/folly/experimental/symbolizer/SignalHandler.cpp b/folly/experimental/symbolizer/SignalHandler.cpp
index 2df79a24ebb4c4e3f77ad5711f4b6cff2ace548d..e21b4638ccd02f24eb326077000efe35577489cf 100644
--- a/folly/experimental/symbolizer/SignalHandler.cpp
+++ b/folly/experimental/symbolizer/SignalHandler.cpp
@@ -30,9 +30,9 @@
 
 #include <glog/logging.h>
 
-#include <folly/Conv.h>
 #include <folly/ScopeGuard.h>
 #include <folly/experimental/symbolizer/Symbolizer.h>
+#include <folly/lang/ToAscii.h>
 #include <folly/portability/SysSyscall.h>
 #include <folly/portability/Unistd.h>
 
@@ -171,26 +171,18 @@ void flush() {
 }
 
 void printDec(uint64_t val) {
-  char buf[20];
-  uint32_t n = uint64ToBufferUnsafe(val, buf);
+  char buf[to_ascii_size_max_decimal<uint64_t>()];
+  size_t n = to_ascii_decimal(buf, val);
   gStackTracePrinter->print(StringPiece(buf, n));
 }
 
-const char kHexChars[] = "0123456789abcdef";
 void printHex(uint64_t val) {
-  // TODO(tudorb): Add this to folly/Conv.h
-  char buf[2 + 2 * sizeof(uint64_t)]; // "0x" prefix, 2 digits for each byte
-
-  char* end = buf + sizeof(buf);
-  char* p = end;
-  do {
-    *--p = kHexChars[val & 0x0f];
-    val >>= 4;
-  } while (val != 0);
-  *--p = 'x';
-  *--p = '0';
-
-  gStackTracePrinter->print(StringPiece(p, end));
+  char buf[2 + to_ascii_size_max<16, uint64_t>()];
+  auto out = buf + 0;
+  *out++ = '0';
+  *out++ = 'x';
+  out += to_ascii_lower<16>(out, val);
+  gStackTracePrinter->print(StringPiece(buf, out - buf));
 }
 
 void dumpTimeInfo() {
diff --git a/folly/experimental/symbolizer/SymbolizePrinter.cpp b/folly/experimental/symbolizer/SymbolizePrinter.cpp
index 17c786888a9ab74e3b1fd04a2a751421aa282fb9..4a0d8af1f00080a737ee84fe1955f0c0d3d306c7 100644
--- a/folly/experimental/symbolizer/SymbolizePrinter.cpp
+++ b/folly/experimental/symbolizer/SymbolizePrinter.cpp
@@ -16,11 +16,11 @@
 
 #include <folly/experimental/symbolizer/SymbolizePrinter.h>
 
-#include <folly/Conv.h>
 #include <folly/Demangle.h>
 #include <folly/FileUtil.h>
 #include <folly/ScopeGuard.h>
 #include <folly/io/IOBuf.h>
+#include <folly/lang/ToAscii.h>
 
 #ifdef __GLIBCXX__
 #include <ext/stdio_filebuf.h>
@@ -113,8 +113,8 @@ void SymbolizePrinter::print(const SymbolizedFrame& frame) {
       }
       doPrint(fileBuf);
 
-      char buf[22];
-      uint32_t n = uint64ToBufferUnsafe(frame.location.line, buf);
+      char buf[to_ascii_size_max_decimal<decltype(frame.location.line)>()];
+      uint32_t n = to_ascii_decimal(buf, frame.location.line);
       doPrint(":");
       doPrint(StringPiece(buf, n));
     } else {
diff --git a/folly/experimental/symbolizer/Symbolizer.cpp b/folly/experimental/symbolizer/Symbolizer.cpp
index ab144c9c48e6dd53319ef7b49ffbd5ad0881b535..58a79fbeaf14958e6e23ed863c91e5dc900c025d 100644
--- a/folly/experimental/symbolizer/Symbolizer.cpp
+++ b/folly/experimental/symbolizer/Symbolizer.cpp
@@ -21,7 +21,6 @@
 #include <cstdlib>
 #include <iostream>
 
-#include <folly/Conv.h>
 #include <folly/FileUtil.h>
 #include <folly/Memory.h>
 #include <folly/ScopeGuard.h>