diff --git a/Crashlytics/CHANGELOG.md b/Crashlytics/CHANGELOG.md
index 5f1d6c961df..756254ae255 100644
--- a/Crashlytics/CHANGELOG.md
+++ b/Crashlytics/CHANGELOG.md
@@ -1,3 +1,8 @@
+# Unreleased
+- [fixed] Installed Crashlytics signal and mach exception handlers synchronously to
+  improve compatibility with other crash reporters and runtime environments (like
+  Mono/Xamarin). (#15383)
+
 # 12.4.0
 - [fixed] Make set development platform APIs to chain on Crashlytics context init promise.
 
diff --git a/Crashlytics/Crashlytics/Components/FIRCLSContext.m b/Crashlytics/Crashlytics/Components/FIRCLSContext.m
index 3242a08e884..b34f98362ba 100644
--- a/Crashlytics/Crashlytics/Components/FIRCLSContext.m
+++ b/Crashlytics/Crashlytics/Components/FIRCLSContext.m
@@ -172,21 +172,17 @@
   // simulator to crash.
   if (!_firclsContext.readonly->debuggerAttached) {
 #if CLS_SIGNAL_SUPPORTED
-    dispatch_group_async(group, queue, ^{
-      _firclsContext.readonly->signal.path =
-          FIRCLSContextAppendToRoot(rootPath, FIRCLSReportSignalFile);
+    _firclsContext.readonly->signal.path =
+        FIRCLSContextAppendToRoot(rootPath, FIRCLSReportSignalFile);
 
-      FIRCLSSignalInitialize(&_firclsContext.readonly->signal);
-    });
+    FIRCLSSignalInitialize(&_firclsContext.readonly->signal);
 #endif
 
 #if CLS_MACH_EXCEPTION_SUPPORTED
-    dispatch_group_async(group, queue, ^{
-      _firclsContext.readonly->machException.path =
-          FIRCLSContextAppendToRoot(rootPath, FIRCLSReportMachExceptionFile);
+    _firclsContext.readonly->machException.path =
+        FIRCLSContextAppendToRoot(rootPath, FIRCLSReportMachExceptionFile);
 
-      FIRCLSMachExceptionInit(&_firclsContext.readonly->machException);
-    });
+    FIRCLSMachExceptionInit(&_firclsContext.readonly->machException);
 #endif
 
     dispatch_group_async(group, queue, ^{