diff --git a/include/fmt/format-inl.h b/include/fmt/format-inl.h
index c5fa83bf..f6573cb9 100644
--- a/include/fmt/format-inl.h
+++ b/include/fmt/format-inl.h
@@ -147,7 +147,7 @@ FMT_FUNC void format_error_code(detail::buffer<char>& out, int error_code,
   if (message.size() <= inline_buffer_size - error_code_size)
     format_to(it, FMT_STRING("{}{}"), message, SEP);
   format_to(it, FMT_STRING("{}{}"), ERROR_STR, error_code);
-  FMT_ASSERT(out.size() <= inline_buffer_size, "must not require dynamic alloc");
+  FMT_ASSERT(out.size() <= inline_buffer_size, "");
 }
 
 FMT_FUNC void report_error(format_func func, int error_code,
@@ -1218,7 +1218,7 @@ struct accumulator {
     if (lower < n) ++upper;
   }
   void operator>>=(int shift) {
-    FMT_ASSERT(shift == 32, "only 32-bit shift is supported");
+    FMT_ASSERT(shift == 32, "");
     (void)shift;
     lower = (upper << 32) | (lower >> 32);
     upper >>= 32;
@@ -1323,7 +1323,7 @@ class bigint {
   int num_bigits() const { return static_cast<int>(bigits_.size()) + exp_; }
 
   FMT_NOINLINE bigint& operator<<=(int shift) {
-    FMT_ASSERT(shift >= 0, "shift must be non-negative");
+    FMT_ASSERT(shift >= 0, "");
     exp_ += shift / bigit_bits;
     shift %= bigit_bits;
     if (shift == 0) return *this;
@@ -1385,7 +1385,7 @@ class bigint {
 
   // Assigns pow(10, exp) to this bigint.
   void assign_pow10(int exp) {
-    FMT_ASSERT(exp >= 0, "exponent must be non-negative");
+    FMT_ASSERT(exp >= 0, "");
     if (exp == 0) return assign(1);
     // Find the top bit.
     int bitmask = 1;
@@ -2556,11 +2556,11 @@ int snprintf_float(T value, int precision, float_specs specs,
       --exp_pos;
     } while (*exp_pos != 'e');
     char sign = exp_pos[1];
-    FMT_ASSERT(sign == '+' || sign == '-', "expect valid sign character");
+    FMT_ASSERT(sign == '+' || sign == '-', "");
     int exp = 0;
     auto p = exp_pos + 2;  // Skip 'e' and sign.
     do {
-      FMT_ASSERT(is_digit(*p), "expect digit");
+      FMT_ASSERT(is_digit(*p), "");
       exp = exp * 10 + (*p++ - '0');
     } while (p != end);
     if (sign == '-') exp = -exp;