diff --git a/src/hash.cpp b/src/hash.cpp
--- a/src/hash.cpp
+++ b/src/hash.cpp
@@ -47,8 +47,10 @@
         switch (vDataToHash.size() & 3) {
             case 3:
                 k1 ^= tail[2] << 16;
+            // FALLTHROUGH
             case 2:
                 k1 ^= tail[1] << 8;
+            // FALLTHROUGH
             case 1:
                 k1 ^= tail[0];
                 k1 *= c1;
diff --git a/src/qt/rpcconsole.cpp b/src/qt/rpcconsole.cpp
--- a/src/qt/rpcconsole.cpp
+++ b/src/qt/rpcconsole.cpp
@@ -269,6 +269,7 @@
                         state = STATE_EATING_SPACES;
                 }
                 if (breakParsing) break;
+                // FALLTHROUGH
             }
             case STATE_ARGUMENT: // In or after argument
             case STATE_EATING_SPACES_IN_ARG:
@@ -403,6 +404,7 @@
                 strResult = lastResult.get_str();
             else
                 strResult = lastResult.write(2);
+        // FALLTHROUGH
         case STATE_ARGUMENT:
         case STATE_EATING_SPACES:
             return true;
diff --git a/src/rest.cpp b/src/rest.cpp
--- a/src/rest.cpp
+++ b/src/rest.cpp
@@ -467,6 +467,7 @@
             std::vector<unsigned char> strRequestV =
                 ParseHex(strRequestMutable);
             strRequestMutable.assign(strRequestV.begin(), strRequestV.end());
+            // FALLTHROUGH
         }
 
         case RF_BINARY: {
diff --git a/src/rpc/mining.cpp b/src/rpc/mining.cpp
--- a/src/rpc/mining.cpp
+++ b/src/rpc/mining.cpp
@@ -708,7 +708,7 @@
             case THRESHOLD_LOCKED_IN:
                 // Ensure bit is set in block version
                 pblock->nVersion |= VersionBitsMask(consensusParams, pos);
-            // FALL THROUGH to get vbavailable set...
+            // FALLTHROUGH to get vbavailable set...
             case THRESHOLD_STARTED: {
                 const struct BIP9DeploymentInfo &vbinfo =
                     VersionBitsDeploymentInfo[pos];
diff --git a/src/tinyformat.h b/src/tinyformat.h
--- a/src/tinyformat.h
+++ b/src/tinyformat.h
@@ -742,6 +742,7 @@
             break;
         case 'X':
             out.setf(std::ios::uppercase);
+        // FALLTHROUGH
         case 'x':
         case 'p':
             out.setf(std::ios::hex, std::ios::basefield);
@@ -749,17 +750,20 @@
             break;
         case 'E':
             out.setf(std::ios::uppercase);
+        // FALLTHROUGH
         case 'e':
             out.setf(std::ios::scientific, std::ios::floatfield);
             out.setf(std::ios::dec, std::ios::basefield);
             break;
         case 'F':
             out.setf(std::ios::uppercase);
+        // FALLTHROUGH
         case 'f':
             out.setf(std::ios::fixed, std::ios::floatfield);
             break;
         case 'G':
             out.setf(std::ios::uppercase);
+        // FALLTHROUGH
         case 'g':
             out.setf(std::ios::dec, std::ios::basefield);
             // As in boost::format, let stream decide float format.