diff --git a/extensions/geoip/AMBuilder b/extensions/geoip/AMBuilder
index 36b6df91..e54ed7c6 100644
--- a/extensions/geoip/AMBuilder
+++ b/extensions/geoip/AMBuilder
@@ -2,6 +2,10 @@
 import os
 
 binary = SM.ExtLibrary(builder, 'geoip.ext')
+if binary.compiler.vendor == 'gcc' or binary.compiler.vendor == 'clang':
+  binary.compiler.cxxflags += ['-fno-rtti']
+elif binary.compiler.vendor == 'msvc':
+  binary.compiler.cxxflags += ['/GR-']
 if builder.target_platform == 'windows':
   binary.compiler.postlink += ['wsock32.lib']
 
diff --git a/extensions/mysql/AMBuilder b/extensions/mysql/AMBuilder
index ab1e00a3..b4bdfb27 100644
--- a/extensions/mysql/AMBuilder
+++ b/extensions/mysql/AMBuilder
@@ -7,6 +7,10 @@ if SM.mysql_root:
     os.path.join(SM.mysql_root, 'include'),
     os.path.join(SM.mms_root, 'core', 'sourcehook')
   ]
+  if binary.compiler.vendor == 'gcc' or binary.compiler.vendor == 'clang':
+    binary.compiler.cxxflags += ['-fno-rtti']
+  elif binary.compiler.vendor == 'msvc':
+    binary.compiler.cxxflags += ['/GR-']
 
   if builder.target_platform == 'linux' or builder.target_platform == 'mac':
     binary.compiler.postlink += [
diff --git a/extensions/regex/AMBuilder b/extensions/regex/AMBuilder
index 696f450e..a95959e7 100644
--- a/extensions/regex/AMBuilder
+++ b/extensions/regex/AMBuilder
@@ -5,6 +5,10 @@ binary = SM.ExtLibrary(builder, 'regex.ext')
 binary.compiler.cxxincludes += [
   os.path.join(SM.mms_root, 'core', 'sourcehook'),
 ]
+if binary.compiler.vendor == 'gcc' or binary.compiler.vendor == 'clang':
+  binary.compiler.cxxflags += ['-fno-rtti']
+elif binary.compiler.vendor == 'msvc':
+  binary.compiler.cxxflags += ['/GR-']
 
 if builder.target_platform == 'linux':
   path = os.path.join(builder.sourcePath, 'extensions', 'regex', 'lib_linux', 'libpcre.a')