diff --git a/samples/benchmark/build.gradle.kts b/samples/benchmark/build.gradle.kts
index db9565d103..6144fa8660 100644
--- a/samples/benchmark/build.gradle.kts
+++ b/samples/benchmark/build.gradle.kts
@@ -54,6 +54,7 @@ teavm {
     wasmGC {
         addedToWebApp = true
         mainClass = "org.teavm.samples.benchmark.teavm.BenchmarkStarter"
+        sourceMap = true
     }
     wasm {
         addedToWebApp = true
diff --git a/tools/core/src/main/java/org/teavm/tooling/TeaVMTool.java b/tools/core/src/main/java/org/teavm/tooling/TeaVMTool.java
index d5cdfc837e..b30b994fea 100644
--- a/tools/core/src/main/java/org/teavm/tooling/TeaVMTool.java
+++ b/tools/core/src/main/java/org/teavm/tooling/TeaVMTool.java
@@ -407,6 +407,7 @@ private WasmGCTarget prepareWebAssemblyGCTarget() {
         target.setDebugInfoLevel(debugInformationGenerated ? WasmDebugInfoLevel.FULL : wasmDebugInfoLevel);
         target.setDebugInfoLocation(wasmDebugInfoLocation);
         if (sourceMapsFileGenerated) {
+            wasmSourceMapWriter = new SourceMapBuilder();
             target.setSourceMapBuilder(wasmSourceMapWriter);
             target.setSourceMapLocation(getResolvedTargetFileName() + ".map");
         }
diff --git a/tools/gradle/src/main/java/org/teavm/gradle/TeaVMExtensionImpl.java b/tools/gradle/src/main/java/org/teavm/gradle/TeaVMExtensionImpl.java
index b15efca44c..e494c7b3eb 100644
--- a/tools/gradle/src/main/java/org/teavm/gradle/TeaVMExtensionImpl.java
+++ b/tools/gradle/src/main/java/org/teavm/gradle/TeaVMExtensionImpl.java
@@ -119,6 +119,7 @@ private void setupWasmGCDefaults() {
                 .map(v -> WasmDebugInfoLocation.valueOf(v.toUpperCase())).orElse(WasmDebugInfoLocation.EXTERNAL));
         wasmGC.getDebugInfoLevel().convention(property("wasm-gc.debugInformation.level")
                 .map(v -> WasmDebugInfoLevel.valueOf(v.toUpperCase())).orElse(WasmDebugInfoLevel.DEOBFUSCATION));
+        wasmGC.getSourceMap().convention(property("wasm-gc.sourceMap").map(Boolean::parseBoolean).orElse(false));
     }
 
     private void setupWasiDefaults() {
diff --git a/tools/gradle/src/main/java/org/teavm/gradle/TeaVMPlugin.java b/tools/gradle/src/main/java/org/teavm/gradle/TeaVMPlugin.java
index 5d824a484a..263f932420 100644
--- a/tools/gradle/src/main/java/org/teavm/gradle/TeaVMPlugin.java
+++ b/tools/gradle/src/main/java/org/teavm/gradle/TeaVMPlugin.java
@@ -225,6 +225,7 @@ private void registerWasmGCTask(Project project, Configuration configuration) {
             task.getTargetFileName().convention(wasmGC.getTargetFileName());
             task.getObfuscated().convention(wasmGC.getObfuscated());
             task.getStrict().convention(wasmGC.getStrict());
+            task.getSourceMap().convention(wasmGC.getSourceMap());
         });
         project.getTasks().create(WASM_GC_COPY_RUNTIME_TASK_NAME, CopyWasmGCRuntimeTask.class, task -> {
             task.setGroup(TASK_GROUP);
diff --git a/tools/gradle/src/main/java/org/teavm/gradle/api/TeaVMWasmGCConfiguration.java b/tools/gradle/src/main/java/org/teavm/gradle/api/TeaVMWasmGCConfiguration.java
index bac4bb61c7..f4e73bdba4 100644
--- a/tools/gradle/src/main/java/org/teavm/gradle/api/TeaVMWasmGCConfiguration.java
+++ b/tools/gradle/src/main/java/org/teavm/gradle/api/TeaVMWasmGCConfiguration.java
@@ -31,4 +31,6 @@ public interface TeaVMWasmGCConfiguration extends TeaVMCommonConfiguration, TeaV
     Property<WasmDebugInfoLocation> getDebugInfoLocation();
 
     Property<WasmDebugInfoLevel> getDebugInfoLevel();
+
+    Property<Boolean> getSourceMap();
 }
diff --git a/tools/gradle/src/main/java/org/teavm/gradle/tasks/GenerateWasmGCTask.java b/tools/gradle/src/main/java/org/teavm/gradle/tasks/GenerateWasmGCTask.java
index 18922b2429..e524e3d75f 100644
--- a/tools/gradle/src/main/java/org/teavm/gradle/tasks/GenerateWasmGCTask.java
+++ b/tools/gradle/src/main/java/org/teavm/gradle/tasks/GenerateWasmGCTask.java
@@ -29,6 +29,7 @@ public GenerateWasmGCTask() {
         getDebugInfo().convention(true);
         getDebugInfoLevel().convention(WasmDebugInfoLevel.DEOBFUSCATION);
         getDebugInfoLocation().convention(WasmDebugInfoLocation.EXTERNAL);
+        getSourceMap().convention(false);
     }
 
     @Input
@@ -46,11 +47,15 @@ public GenerateWasmGCTask() {
     @Input
     public abstract Property<WasmDebugInfoLocation> getDebugInfoLocation();
 
+    @Input
+    public abstract Property<Boolean> getSourceMap();
+
     @Override
     protected void setupBuilder(BuildStrategy builder) {
         builder.setStrict(getStrict().get());
         builder.setObfuscated(getObfuscated().get());
         builder.setDebugInformationGenerated(getDebugInfo().get());
+        builder.setSourceMapsFileGenerated(getSourceMap().get());
         switch (getDebugInfoLevel().get()) {
             case FULL:
                 builder.setWasmDebugInfoLevel(org.teavm.backend.wasm.WasmDebugInfoLevel.FULL);