diff --git a/packages/browser-utils/rollup.npm.config.mjs b/packages/browser-utils/rollup.npm.config.mjs
index d28a7a6f54a0..e616bb7c0d70 100644
--- a/packages/browser-utils/rollup.npm.config.mjs
+++ b/packages/browser-utils/rollup.npm.config.mjs
@@ -9,7 +9,7 @@ export default makeNPMConfigVariants(
         // set preserveModules to true because we don't want to bundle everything into one file.
         preserveModules:
           process.env.SENTRY_BUILD_PRESERVE_MODULES === undefined
-            ? true
+            ? false
             : Boolean(process.env.SENTRY_BUILD_PRESERVE_MODULES),
       },
     },
diff --git a/packages/browser/rollup.npm.config.mjs b/packages/browser/rollup.npm.config.mjs
index 00251eea81fd..3eda31f6b4ec 100644
--- a/packages/browser/rollup.npm.config.mjs
+++ b/packages/browser/rollup.npm.config.mjs
@@ -11,7 +11,7 @@ export default makeNPMConfigVariants(
         // set preserveModules to true because we don't want to bundle everything into one file.
         preserveModules:
           process.env.SENTRY_BUILD_PRESERVE_MODULES === undefined
-            ? true
+            ? false
             : Boolean(process.env.SENTRY_BUILD_PRESERVE_MODULES),
       },
     },
diff --git a/packages/bun/rollup.npm.config.mjs b/packages/bun/rollup.npm.config.mjs
index 84a06f2fb64a..5d117fce85b3 100644
--- a/packages/bun/rollup.npm.config.mjs
+++ b/packages/bun/rollup.npm.config.mjs
@@ -1,3 +1,9 @@
 import { makeBaseNPMConfig, makeNPMConfigVariants } from '@sentry-internal/rollup-utils';
 
-export default makeNPMConfigVariants(makeBaseNPMConfig());
+export default makeNPMConfigVariants(makeBaseNPMConfig({
+  packageSpecificConfig: {
+    output: {
+      preserveModules: false
+    }
+  }
+}));
diff --git a/packages/core/rollup.npm.config.mjs b/packages/core/rollup.npm.config.mjs
index cc3ad4064820..bf90179a654f 100644
--- a/packages/core/rollup.npm.config.mjs
+++ b/packages/core/rollup.npm.config.mjs
@@ -23,7 +23,7 @@ export default makeNPMConfigVariants(
         // set preserveModules to true because we don't want to bundle everything into one file.
         preserveModules:
           process.env.SENTRY_BUILD_PRESERVE_MODULES === undefined
-            ? true
+            ? false
             : Boolean(process.env.SENTRY_BUILD_PRESERVE_MODULES),
       },
       plugins: [
diff --git a/packages/deno/rollup.npm.config.mjs b/packages/deno/rollup.npm.config.mjs
index 41a1be69695d..33f8cfe8b978 100644
--- a/packages/deno/rollup.npm.config.mjs
+++ b/packages/deno/rollup.npm.config.mjs
@@ -1,3 +1,9 @@
 import { makeBaseNPMConfig, makeNPMConfigVariants } from '@sentry-internal/rollup-utils';
 
-export default makeNPMConfigVariants(makeBaseNPMConfig(), { emitCjs: false });
+export default makeNPMConfigVariants(makeBaseNPMConfig({
+  packageSpecificConfig: {
+    output: {
+      preserveModules: false
+    }
+  }
+}), { emitCjs: false });
diff --git a/packages/nestjs/rollup.npm.config.mjs b/packages/nestjs/rollup.npm.config.mjs
index 0ce71546935c..471538590833 100644
--- a/packages/nestjs/rollup.npm.config.mjs
+++ b/packages/nestjs/rollup.npm.config.mjs
@@ -3,5 +3,8 @@ import { makeBaseNPMConfig, makeNPMConfigVariants } from '@sentry-internal/rollu
 export default makeNPMConfigVariants(
   makeBaseNPMConfig({
     entrypoints: ['src/index.ts', 'src/setup.ts'],
+    output: {
+      preserveModules: false
+    }
   }),
 );
diff --git a/packages/node-core/rollup.npm.config.mjs b/packages/node-core/rollup.npm.config.mjs
index 8e18333836ef..4b35c2c7d881 100644
--- a/packages/node-core/rollup.npm.config.mjs
+++ b/packages/node-core/rollup.npm.config.mjs
@@ -24,7 +24,7 @@ export default [
         output: {
           // set exports to 'named' or 'auto' so that rollup doesn't warn
           exports: 'named',
-          preserveModules: true,
+          preserveModules: false,
         },
         plugins: [
           replace({
diff --git a/packages/node-native/rollup.npm.config.mjs b/packages/node-native/rollup.npm.config.mjs
index ce79b0ac9bbb..0ed0fe26a2cc 100644
--- a/packages/node-native/rollup.npm.config.mjs
+++ b/packages/node-native/rollup.npm.config.mjs
@@ -8,7 +8,7 @@ export default makeNPMConfigVariants(
         dir: 'build',
         // set exports to 'named' or 'auto' so that rollup doesn't warn
         exports: 'named',
-        preserveModules: true,
+        preserveModules: false,
       },
     },
   }),
diff --git a/packages/node/rollup.npm.config.mjs b/packages/node/rollup.npm.config.mjs
index 93fd1d8c16ca..250dc76d87c0 100644
--- a/packages/node/rollup.npm.config.mjs
+++ b/packages/node/rollup.npm.config.mjs
@@ -9,7 +9,7 @@ export default [
         output: {
           // set exports to 'named' or 'auto' so that rollup doesn't warn
           exports: 'named',
-          preserveModules: true,
+          preserveModules: false,
         },
       },
     }),
diff --git a/packages/react/rollup.npm.config.mjs b/packages/react/rollup.npm.config.mjs
index 923dfafb85d7..be4bac90634f 100644
--- a/packages/react/rollup.npm.config.mjs
+++ b/packages/react/rollup.npm.config.mjs
@@ -3,6 +3,9 @@ import { makeBaseNPMConfig, makeNPMConfigVariants } from '@sentry-internal/rollu
 export default makeNPMConfigVariants(
   makeBaseNPMConfig({
     packageSpecificConfig: {
+      output: {
+        preserveModules: true,
+      },
       external: ['react', 'react/jsx-runtime'],
     },
     sucrase: {