diff --git a/CHANGELOG.md b/CHANGELOG.md
index 98f7cfe2..bd05a467 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -27,6 +27,7 @@ Bug Fixes:
 - Quote launch arguments sent to the terminal if they have special characters. [#2898](https://github.com/microsoft/vscode-cmake-tools/issues/2898)
 - CMake Tools should choose cmake.exe from the newest VS when it's not found in the PATH. [#2753](https://github.com/microsoft/vscode-cmake-tools/issues/2753)
 - Calling build targets from CMake Project Outline always builds default target if useTasks option is set. [#2778](https://github.com/microsoft/vscode-cmake-tools/issues/2768) [@piomis]](https://github.com/piomis)
+- Fix a problem with multi-root projects not activating the configuration provider. [#2915](https://github.com/microsoft/vscode-cmake-tools/issues/2915)
 - Remove the default path for `cmake.mingwSearchDirs` since the path is world-writable. [PR #2942](https://github.com/microsoft/vscode-cmake-tools/pull/2942)
 - Build command is not able to properly pick-up tasks from tasks.json file if configured with isDefault option and cancellation of running build task is not working. [#2935](https://github.com/microsoft/vscode-cmake-tools/issues/2935) [@piomis]](https://github.com/piomis)
 
diff --git a/src/cpptools.ts b/src/cpptools.ts
index e378bfbc..f80fd6da 100644
--- a/src/cpptools.ts
+++ b/src/cpptools.ts
@@ -639,9 +639,12 @@ export class CppConfigurationProvider implements cpptools.CustomConfigurationPro
         this.lastUpdateSucceeded = !hadMissingCompilers;
     }
 
-    private ready: boolean = false;
+    private readyFlag: boolean = false;
+    get ready(): boolean {
+        return this.readyFlag;
+    }
     markAsReady() {
-        this.ready = true;
+        this.readyFlag = true;
     }
 
     getDiagnostics(): DiagnosticsCpptools {
@@ -666,7 +669,7 @@ export class CppConfigurationProvider implements cpptools.CustomConfigurationPro
         }
 
         return {
-            isReady: this.ready,
+            isReady: this.readyFlag,
             hasCodeModel: this.fileIndex.size > 0,
             activeBuildType: this.activeBuildType || "",
             buildTypesSeen: [...this.buildTypesSeen.values()],
diff --git a/src/extension.ts b/src/extension.ts
index 2a7303d9..a5aec351 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -589,7 +589,6 @@ export class ExtensionManager implements vscode.Disposable {
         }
     }
 
-    private cpptoolsNumFoldersReady: number = 0;
     private updateCodeModel(cmakeProject?: CMakeProject) {
         if (!cmakeProject) {
             return;
@@ -674,17 +673,19 @@ export class ExtensionManager implements vscode.Disposable {
                 }
                 // Inform cpptools that custom CppConfigurationProvider will be able to service the current workspace.
                 this.ensureCppToolsProviderRegistered();
-                if (cpptools.notifyReady && this.cpptoolsNumFoldersReady < this.projectController.numOfWorkspaceFolders) {
-                    ++this.cpptoolsNumFoldersReady;
-                    if (this.cpptoolsNumFoldersReady === this.projectController.numOfWorkspaceFolders) {
-                        // Notify cpptools that the provider is ready to provide IntelliSense configurations.
-                        cpptools.notifyReady(this.configProvider);
-                        this.configProvider.markAsReady();
-                    }
-                } else {
+                if (this.configProvider.ready) {
+                    // TODO: Make this smarter and only notify when there are changes to files that have been requested by cpptools already.
                     cpptools.didChangeCustomBrowseConfiguration(this.configProvider);
                     cpptools.didChangeCustomConfiguration(this.configProvider);
+                } else {
                     this.configProvider.markAsReady();
+                    if (cpptools.notifyReady) {
+                        // Notify cpptools that the provider is ready to provide IntelliSense configurations.
+                        cpptools.notifyReady(this.configProvider);
+                    } else {
+                        cpptools.didChangeCustomBrowseConfiguration(this.configProvider);
+                        cpptools.didChangeCustomConfiguration(this.configProvider);
+                    }
                 }
             }
         });
diff --git a/src/projectController.ts b/src/projectController.ts
index 6702b5ee..5d3ce96d 100644
--- a/src/projectController.ts
+++ b/src/projectController.ts
@@ -113,6 +113,14 @@ export class ProjectController implements vscode.Disposable {
         return this.getAllCMakeProjects().length;
     }
 
+    async getNumOfValidProjects(): Promise<number> {
+        let count: number = 0;
+        for (const project of this.getAllCMakeProjects()) {
+            count += (await project.hasCMakeLists() ? 1 : 0);
+        }
+        return count;
+    }
+
     get hasMultipleProjects(): boolean {
         return this.numOfProjects > 1;
     }