diff --git a/libc/src/__support/float_to_string.h b/libc/src/__support/float_to_string.h
index 9115ed2856881..44853059a8da3 100644
--- a/libc/src/__support/float_to_string.h
+++ b/libc/src/__support/float_to_string.h
@@ -618,16 +618,18 @@ template <> class FloatToString<long double> {
   fputil::FPBits<long double> float_bits;
   bool is_negative = 0;
   int exponent = 0;
-  FPBits::StorageType mantissa = 0;
+  fputil::FPBits<long double>::StorageType mantissa = 0;
 
   static constexpr int FRACTION_LEN = fputil::FPBits<long double>::FRACTION_LEN;
   static constexpr int EXP_BIAS = fputil::FPBits<long double>::EXP_BIAS;
   static constexpr size_t UINT_WORD_SIZE = 64;
 
   static constexpr size_t FLOAT_AS_INT_WIDTH =
-      internal::div_ceil(fputil::FPBits<long double>::MAX_BIASED_EXPONENT -
-                             FPBits::EXP_BIAS,
-                         UINT_WORD_SIZE) *
+      internal::div_ceil(
+          fputil::FPBits<long double>::MAX_BIASED_EXPONENT -
+              fputil::FPBits<long double>::EXP_BIAS +
+              FRACTION_LEN, // Add fraction len to provide space for subnormals.
+          UINT_WORD_SIZE) *
       UINT_WORD_SIZE;
   static constexpr size_t EXTRA_INT_WIDTH =
       internal::div_ceil(sizeof(long double) * CHAR_BIT, UINT_WORD_SIZE) *
@@ -699,12 +701,11 @@ template <> class FloatToString<long double> {
       float_as_fixed = mantissa;
 
       const int SHIFT_AMOUNT = FLOAT_AS_INT_WIDTH + exponent;
+      // if the shift amount would be negative, then the shift would cause a
+      // loss of precision.
+      LIBC_ASSERT(SHIFT_AMOUNT >= 0);
       static_assert(EXTRA_INT_WIDTH >= sizeof(long double) * 8);
-      if (SHIFT_AMOUNT > 0) {
-        float_as_fixed <<= SHIFT_AMOUNT;
-      } else {
-        float_as_fixed >>= -SHIFT_AMOUNT;
-      }
+      float_as_fixed <<= SHIFT_AMOUNT;
 
       // If there are still digits above the decimal point, handle those.
       if (cpp::countl_zero(float_as_fixed) <
diff --git a/libc/test/src/stdio/sprintf_test.cpp b/libc/test/src/stdio/sprintf_test.cpp
index 42fdd59cf4d9c..689a38a49f13c 100644
--- a/libc/test/src/stdio/sprintf_test.cpp
+++ b/libc/test/src/stdio/sprintf_test.cpp
@@ -2484,6 +2484,18 @@ TEST(LlvmLibcSPrintfTest, FloatExponentLongDoubleConv) {
 
   written = LIBC_NAMESPACE::sprintf(buff, "%Le", 1.2345678e4900L);
   ASSERT_STREQ_LEN(written, buff, "1.234568e+4900");
+
+#ifndef LIBC_COPT_FLOAT_TO_STR_REDUCED_PRECISION
+  // Minimum normal + epsilon
+  written =
+      LIBC_NAMESPACE::sprintf(buff, "%.20Le", 3.36210314311209350663E-4932L);
+  ASSERT_STREQ_LEN(written, buff, "3.36210314311209350663e-4932");
+
+  // Minimum subnormal
+  written =
+      LIBC_NAMESPACE::sprintf(buff, "%.20Le", 3.64519953188247460253E-4951L);
+  ASSERT_STREQ_LEN(written, buff, "3.64519953188247460253e-4951");
+#endif // LIBC_COPT_FLOAT_TO_STR_REDUCED_PRECISION
 #endif
 }