diff --git a/lib/importproject.cpp b/lib/importproject.cpp
index 146456684..21ff348ae 100644
--- a/lib/importproject.cpp
+++ b/lib/importproject.cpp
@@ -424,15 +424,17 @@ void ImportProject::importCompileCommands(std::istream &istr)
             continue;
 
         struct FileSettings fs;
-        if (Path::isAbsolute(file) || Path::fileExists(file))
-            fs.filename = file;
-        else {
-            std::string path = directory;
-            if (!path.empty() && !endsWith(path,'/'))
-                path += '/';
-            path += file;
-            fs.filename = Path::simplifyPath(path);
-        }
+        if (Path::isAbsolute(file))
+            fs.filename = Path::simplifyPath(file);
+#ifdef _WIN32
+        else if (file[0] == '/' && directory.size() > 2 && std::isalpha(directory[0]) && directory[1] == ':')
+            // directory: C:\foo\bar
+            // file: /xy/z.c
+            // => c:/xy/z.c
+            fs.filename = Path::simplifyPath(directory.substr(0,2) + file);
+#endif
+        else
+            fs.filename = Path::simplifyPath(directory + file);
         fs.parseCommand(command); // read settings; -D, -I, -U, -std, -m*, -f*
         std::map<std::string, std::string, cppcheck::stricmp> variables;
         fs.setIncludePaths(directory, fs.includePaths, variables);
diff --git a/test/cli/test-inline-suppress.py b/test/cli/test-inline-suppress.py
index b4a35094e..5c4fef176 100644
--- a/test/cli/test-inline-suppress.py
+++ b/test/cli/test-inline-suppress.py
@@ -7,8 +7,8 @@ import re
 from testutils import cppcheck
 
 def create_unused_function_compile_commands():
-    compile_commands = os.path.join('proj-inline-suppress-unusedFunction', 'compile_commands.json')
-    prjpath = os.path.join(os.getcwd(), 'proj-inline-suppress-unusedFunction')
+    prjpath = os.path.realpath('proj-inline-suppress-unusedFunction')
+    compile_commands = os.path.join(prjpath, 'compile_commands.json')
     j = [{'directory': prjpath,
           'command': '/usr/bin/c++ -I"' + prjpath + '" -o "' + os.path.join(prjpath, 'B.cpp.o') + '" -c "' + os.path.join(prjpath, 'B.cpp') + '"',
           'file': os.path.join(prjpath, 'B.cpp')},
diff --git a/test/cli/test-proj2.py b/test/cli/test-proj2.py
index 3918bf404..63495690d 100644
--- a/test/cli/test-proj2.py
+++ b/test/cli/test-proj2.py
@@ -19,7 +19,7 @@ def realpath(s):
 
 def create_compile_commands():
     j = [{'directory': realpath('proj2/a'), 'command': 'gcc -c a.c', 'file': 'a.c'},
-         {'directory': realpath('proj2/b'), 'command': 'gcc -c b.c', 'file': 'b.c'}]
+         {'directory': realpath('proj2'), 'command': 'gcc -c b/b.c', 'file': 'b/b.c'}]
     f = open('proj2/' + COMPILE_COMMANDS_JSON, 'wt')
     f.write(json.dumps(j))
 
diff --git a/test/testimportproject.cpp b/test/testimportproject.cpp
index aea5ba890..0d7a04469 100644
--- a/test/testimportproject.cpp
+++ b/test/testimportproject.cpp
@@ -44,7 +44,7 @@ private:
         TEST_CASE(setIncludePaths2);
         TEST_CASE(setIncludePaths3); // macro names are case insensitive
         TEST_CASE(importCompileCommands1);
-        TEST_CASE(importCompileCommands2); // #8563
+        TEST_CASE(importCompileCommands2); // #8563, #9567
         TEST_CASE(importCompileCommands3); // check with existing trailing / in directory
         TEST_CASE(importCompileCommands4); // only accept certain file types
         TEST_CASE(importCompileCommands5); // Windows/CMake/Ninja generated comile_commands.json
@@ -116,16 +116,30 @@ private:
     }
 
     void importCompileCommands2() const {
+        // Absolute file path
+#ifdef _WIN32
         const char json[] = R"([{
-                                   "directory": "/tmp",
-                                   "command": "gcc -c src.c",
-                                   "file": "src.c"
+                                   "directory": "C:/foo",
+                                   "command": "gcc -c /bar.c",
+                                   "file": "/bar.c"
                                }])";
         std::istringstream istr(json);
         TestImporter importer;
         importer.importCompileCommands(istr);
         ASSERT_EQUALS(1, importer.fileSettings.size());
-        ASSERT_EQUALS("/tmp/src.c", importer.fileSettings.begin()->filename);
+        ASSERT_EQUALS("C:/bar.c", importer.fileSettings.begin()->filename);
+#else
+        const char json[] = R"([{
+                                   "directory": "/foo",
+                                   "command": "gcc -c bar.c",
+                                   "file": "/bar.c"
+                               }])";
+        std::istringstream istr(json);
+        TestImporter importer;
+        importer.importCompileCommands(istr);
+        ASSERT_EQUALS(1, importer.fileSettings.size());
+        ASSERT_EQUALS("/bar.c", importer.fileSettings.begin()->filename);
+#endif
     }
 
     void importCompileCommands3() const {