diff --git a/data/md5sum.txt b/data/md5sum.txt
index a84c410..964ebaa 100644
--- a/data/md5sum.txt
+++ b/data/md5sum.txt
@@ -1,16 +1,16 @@
 46e60a92266ed0f913f5efb9b7c0473c  tests/reads.sam
-514bf940e7d5f44e57291a75e1fc6629  tests/reads_pe_1.fq
-5487eb32b5492ddba3a95a8461e2ff4c  tests/reads_pbat_pe_1.fq
 57fd6ff3b49f4656c9506688040b7ce6  tests/tRex1.idx
-64e17fc1e424f9cb21879d38ddf745e5  tests/reads_pe_2.fq
-8bfa00acd0639dc66acd5aa8ac0369d5  tests/reads_rpbat_pe_2.fq
 981dd110d1675c77533a485204fb13cc  tests/reads.mstats
 9b78ffb855d8a94604973118f2e19457  tests/reads_pbat_pe.sam
 a6a3a12238013d8081c3e06dd43d538c  tests/reads_pe.sam
 a6e138f4b89ef2dc0b90004baadddb9b  tests/reads_pbat_pe.mstats
-aff19aeae4184c38cf364b3a94527098  tests/reads_pbat_pe_2.fq
 bd54ba1e720039cb4b662faa4f0e04b3  tests/reads_rpbat_pe.mstats
 d7a9e3f6a5ed7373a827f07aaf32803a  tests/reads_pe.mstats
-e94e71292fccd255bad3f3694efe7a4b  tests/reads_rpbat_pe_1.fq
-e95a8739a378bc5628c76ffbe8293682  tests/reads_1.fq
 edf2c97162f7910949520ed60d82f205  tests/reads_rpbat_pe.sam
+d3c8f80d1c478f2be3477c366f563de0  tests/reads_1.fq
+02decde770526f8545fa30514d717740  tests/reads_pbat_pe_1.fq
+a8af19625ceae38dedf98a2d3496fd67  tests/reads_pbat_pe_2.fq
+99de2ab83cd316abd986e5d89e135982  tests/reads_pe_1.fq
+e6e7634b3d54d3362c1e6ec026783c70  tests/reads_pe_2.fq
+005cab62b8f42d2d0fc856a7165422fd  tests/reads_rpbat_pe_1.fq
+900ebf83246886c1864635fbb5647b36  tests/reads_rpbat_pe_2.fq
diff --git a/src/simreads.cpp b/src/simreads.cpp
index 2e67769..d8c4d75 100644
--- a/src/simreads.cpp
+++ b/src/simreads.cpp
@@ -78,9 +78,10 @@ rand_double() -> double {  // ADS: in the interval [0, 1]
 }
 }  // namespace simreads_random
 
-static inline auto
+[[nodiscard]] static inline auto
 format_fastq_record(const std::string &name,
                     const std::string &read) -> std::string {
+  static constexpr auto assumed_quality_score = 63;
   assert(!name.empty());
   std::string s;
   s += '@';
@@ -88,7 +89,7 @@ format_fastq_record(const std::string &name,
   s += '\n';
   s += read;
   s += "\n+\n";
-  s += std::string(std::size(read), 'B');
+  s += std::string(std::size(read), assumed_quality_score);
   return s;
 }