4 files changed, 5 insertions, 5 deletions
diff --git a/src/lib/compression/bzip2/bzip2.cpp b/src/lib/compression/bzip2/bzip2.cpp
index 09cd05919..d9ada84f6 100644
--- a/src/lib/compression/bzip2/bzip2.cpp
+++ b/src/lib/compression/bzip2/bzip2.cpp
@@ -37,7 +37,7 @@ class Bzip2_Stream : public Zlib_Style_Stream<bz_stream, char>
 class Bzip2_Compression_Stream : public Bzip2_Stream
    {
    public:
-      Bzip2_Compression_Stream(size_t block_size)
+      explicit Bzip2_Compression_Stream(size_t block_size)
          {
          int rc = BZ2_bzCompressInit(streamp(), block_size, 0, 0);
 
diff --git a/src/lib/compression/compression.cpp b/src/lib/compression/compression.cpp
index 178de245f..54faec7b8 100644
--- a/src/lib/compression/compression.cpp
+++ b/src/lib/compression/compression.cpp
@@ -56,7 +56,7 @@ void Compression_Alloc_Info::do_free(void* ptr)
 
 namespace {
 
-Compressor_Transform* do_make_compressor(const std::string& type, const std::string suffix)
+Compressor_Transform* do_make_compressor(const std::string& type, const std::string& suffix)
    {
    const std::map<std::string, std::string> trans{
       {"zlib", "Zlib"},
diff --git a/src/lib/compression/lzma/lzma.cpp b/src/lib/compression/lzma/lzma.cpp
index 5998d1c8c..3cc03a098 100644
--- a/src/lib/compression/lzma/lzma.cpp
+++ b/src/lib/compression/lzma/lzma.cpp
@@ -56,7 +56,7 @@ class LZMA_Stream : public Zlib_Style_Stream<lzma_stream, byte>
 class LZMA_Compression_Stream : public LZMA_Stream
    {
    public:
-      LZMA_Compression_Stream(size_t level)
+      explicit LZMA_Compression_Stream(size_t level)
          {
          lzma_ret rc = ::lzma_easy_encoder(streamp(), level, LZMA_CHECK_CRC64);
 
diff --git a/src/lib/compression/zlib/zlib.cpp b/src/lib/compression/zlib/zlib.cpp
index 8e1928826..6df5ee931 100644
--- a/src/lib/compression/zlib/zlib.cpp
+++ b/src/lib/compression/zlib/zlib.cpp
@@ -115,7 +115,7 @@ class Deflate_Compression_Stream : public Zlib_Compression_Stream
 class Deflate_Decompression_Stream : public Zlib_Decompression_Stream
    {
    public:
-      Deflate_Decompression_Stream(int wbits) : Zlib_Decompression_Stream(wbits, -1) {}
+      explicit Deflate_Decompression_Stream(int wbits) : Zlib_Decompression_Stream(wbits, -1) {}
    };
 
 class Gzip_Compression_Stream : public Zlib_Compression_Stream
@@ -140,7 +140,7 @@ class Gzip_Compression_Stream : public Zlib_Compression_Stream
 class Gzip_Decompression_Stream : public Zlib_Decompression_Stream
    {
    public:
-      Gzip_Decompression_Stream(int wbits) : Zlib_Decompression_Stream(wbits, 16) {}
+      explicit Gzip_Decompression_Stream(int wbits) : Zlib_Decompression_Stream(wbits, 16) {}
    };
 
 }