diff --git a/doc/developer-notes.md b/doc/developer-notes.md
index 4821a59f1..2fa91ecb0 100644
--- a/doc/developer-notes.md
+++ b/doc/developer-notes.md
@@ -595,6 +595,12 @@ Source code organization
 
   - *Rationale*: Shorter and simpler header files are easier to read, and reduce compile time
 
+- Use only the lowercase alphanumerics (`a-z0-9`), underscore (`_`) and hyphen (`-`) in source code filenames.
+
+  - *Rationale*: `grep`:ing and auto-completing filenames is easier when using a consistent
+    naming pattern. Potential problems when building on case-insensitive filesystems are
+    avoided when using only lowercase characters in source code filenames.
+
 - Every `.cpp` and `.h` file should `#include` every header file it directly uses classes, functions or other
   definitions from, even if those headers are already included indirectly through other headers.
 
diff --git a/src/Makefile.bench.include b/src/Makefile.bench.include
index 32de1582f..bc2c46f22 100644
--- a/src/Makefile.bench.include
+++ b/src/Makefile.bench.include
@@ -17,7 +17,7 @@ bench_bench_bitcoin_SOURCES = \
   bench/bench.h \
   bench/checkblock.cpp \
   bench/checkqueue.cpp \
-  bench/Examples.cpp \
+  bench/examples.cpp \
   bench/rollingbloom.cpp \
   bench/crypto_hash.cpp \
   bench/ccoins_caching.cpp \
diff --git a/src/Makefile.test.include b/src/Makefile.test.include
index 94f4e3876..a4d31795e 100644
--- a/src/Makefile.test.include
+++ b/src/Makefile.test.include
@@ -46,7 +46,7 @@ BITCOIN_TESTS =\
   test/compress_tests.cpp \
   test/crypto_tests.cpp \
   test/cuckoocache_tests.cpp \
-  test/DoS_tests.cpp \
+  test/denialofservice_tests.cpp \
   test/getarg_tests.cpp \
   test/hash_tests.cpp \
   test/key_io_tests.cpp \
@@ -71,7 +71,7 @@ BITCOIN_TESTS =\
   test/rpc_tests.cpp \
   test/sanity_tests.cpp \
   test/scheduler_tests.cpp \
-  test/script_P2SH_tests.cpp \
+  test/script_p2sh_tests.cpp \
   test/script_tests.cpp \
   test/script_standard_tests.cpp \
   test/scriptnum_tests.cpp \
diff --git a/src/bench/Examples.cpp b/src/bench/examples.cpp
similarity index 100%
rename from src/bench/Examples.cpp
rename to src/bench/examples.cpp
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index fc05dd2ad..de456e87f 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -561,7 +561,7 @@ static void FindNextBlocksToDownload(NodeId nodeid, unsigned int count, std::vec
 } // namespace
 
 // This function is used for testing the stale tip eviction logic, see
-// DoS_tests.cpp
+// denialofservice_tests.cpp
 void UpdateLastBlockAnnounceTime(NodeId node, int64_t time_in_seconds)
 {
     LOCK(cs_main);
diff --git a/src/test/DoS_tests.cpp b/src/test/denialofservice_tests.cpp
similarity index 99%
rename from src/test/DoS_tests.cpp
rename to src/test/denialofservice_tests.cpp
index 1868aed7d..e5f914ba8 100644
--- a/src/test/DoS_tests.cpp
+++ b/src/test/denialofservice_tests.cpp
@@ -42,7 +42,7 @@ static NodeId id = 0;
 
 void UpdateLastBlockAnnounceTime(NodeId node, int64_t time_in_seconds);
 
-BOOST_FIXTURE_TEST_SUITE(DoS_tests, TestingSetup)
+BOOST_FIXTURE_TEST_SUITE(denialofservice_tests, TestingSetup)
 
 // Test eviction of an outbound peer whose chain never advances
 // Mock a node connection, and use mocktime to simulate a peer
diff --git a/src/test/script_P2SH_tests.cpp b/src/test/script_p2sh_tests.cpp
similarity index 99%
rename from src/test/script_P2SH_tests.cpp
rename to src/test/script_p2sh_tests.cpp
index 63d211dd9..803a673fa 100644
--- a/src/test/script_P2SH_tests.cpp
+++ b/src/test/script_p2sh_tests.cpp
@@ -46,7 +46,7 @@ Verify(const CScript& scriptSig, const CScript& scriptPubKey, bool fStrict, Scri
 }
 
 
-BOOST_FIXTURE_TEST_SUITE(script_P2SH_tests, BasicTestingSetup)
+BOOST_FIXTURE_TEST_SUITE(script_p2sh_tests, BasicTestingSetup)
 
 BOOST_AUTO_TEST_CASE(sign)
 {