diff --git a/contrib/buildbot/server.py b/contrib/buildbot/server.py
--- a/contrib/buildbot/server.py
+++ b/contrib/buildbot/server.py
@@ -269,14 +269,18 @@
         builds = []
         for build_name, v in config.get('builds', {}).items():
             if v.get('runOnDiff', False):
-                diffRegex = v.get('runOnDiffRegex', None)
-                if diffRegex:
+                diffRegexes = v.get('runOnDiffRegex', None)
+                if diffRegexes:
                     # If the regex matches at least one changed file, add this
                     # build to the list.
-                    for _, changedFile in changedFiles.items():
-                        if re.match(diffRegex, changedFile):
-                            builds.append(build_name)
-                            break
+                    def regexesMatchAnyFile(regexes, files):
+                        for regex in regexes:
+                            for _, filename in files.items():
+                                if re.match(regex, filename):
+                                    return True
+                        return False
+                    if regexesMatchAnyFile(diffRegexes, changedFiles):
+                        builds.append(build_name)
                 else:
                     builds.append(build_name)
 
diff --git a/contrib/buildbot/test/test_endpoint_buildDiff.py b/contrib/buildbot/test/test_endpoint_buildDiff.py
--- a/contrib/buildbot/test/test_endpoint_buildDiff.py
+++ b/contrib/buildbot/test/test_endpoint_buildDiff.py
@@ -121,7 +121,7 @@
         set_build_configuration({
             "build-1": {
                 "runOnDiff": True,
-                "runOnDiffRegex": "dir/subdir/.*",
+                "runOnDiffRegex": ["dir/subdir/.*"],
             },
         })
         call_buildDiff(builds)
@@ -130,7 +130,7 @@
         set_build_configuration({
             "build-1": {
                 "runOnDiff": True,
-                "runOnDiffRegex": "dir/nonmatching/.*",
+                "runOnDiffRegex": ["dir/nonmatching/.*"],
             },
         })
         call_buildDiff([])
@@ -140,11 +140,11 @@
         set_build_configuration({
             "build-1": {
                 "runOnDiff": True,
-                "runOnDiffRegex": "dir/nonmatching/.*",
+                "runOnDiffRegex": ["dir/nonmatching/.*"],
             },
             "build-2": {
                 "runOnDiff": True,
-                "runOnDiffRegex": "someotherdir/file2.txt",
+                "runOnDiffRegex": ["someotherdir/file2.txt"],
             },
         })
         call_buildDiff([builds[1]])
diff --git a/contrib/teamcity/build-configurations.yml b/contrib/teamcity/build-configurations.yml
--- a/contrib/teamcity/build-configurations.yml
+++ b/contrib/teamcity/build-configurations.yml
@@ -404,7 +404,8 @@
 
   check-buildbot:
     runOnDiff: true
-    runOnDiffRegex: contrib/buildbot/.*
+    runOnDiffRegex:
+      - contrib/buildbot/.*
     targets:
       - - check-buildbot
     timeout: 600