diff --git a/packages/metro-source-map/src/__tests__/__snapshots__/source-map-test.js.snap b/packages/metro-source-map/src/__tests__/__snapshots__/source-map-test.js.snap
index f7ad4c3cdb..83d248696a 100644
--- a/packages/metro-source-map/src/__tests__/__snapshots__/source-map-test.js.snap
+++ b/packages/metro-source-map/src/__tests__/__snapshots__/source-map-test.js.snap
@@ -8,10 +8,6 @@ Array [
       "line": 1,
     },
     "name": null,
-    "original": Object {
-      "column": null,
-      "line": null,
-    },
     "source": null,
   },
   Object {
@@ -56,10 +52,6 @@ Array [
       "line": 12,
     },
     "name": null,
-    "original": Object {
-      "column": null,
-      "line": null,
-    },
     "source": null,
   },
   Object {
@@ -80,10 +72,6 @@ Array [
       "line": 25,
     },
     "name": null,
-    "original": Object {
-      "column": null,
-      "line": null,
-    },
     "source": null,
   },
   Object {
diff --git a/packages/metro-source-map/src/source-map.js b/packages/metro-source-map/src/source-map.js
index 29935b247e..3c507086ea 100644
--- a/packages/metro-source-map/src/source-map.js
+++ b/packages/metro-source-map/src/source-map.js
@@ -206,18 +206,29 @@ function toBabelSegments(
   const rawMappings: Array<BabelSourceMapSegment> = [];
 
   new SourceMap.SourceMapConsumer(sourceMap).eachMapping(map => {
-    rawMappings.push({
-      generated: {
-        line: map.generatedLine,
-        column: map.generatedColumn,
-      },
-      original: {
-        line: map.originalLine,
-        column: map.originalColumn,
-      },
-      source: map.source,
-      name: map.name,
-    });
+    rawMappings.push(
+      map.originalLine == null || map.originalColumn == null
+        ? {
+            generated: {
+              line: map.generatedLine,
+              column: map.generatedColumn,
+            },
+            source: map.source,
+            name: map.name,
+          }
+        : {
+            generated: {
+              line: map.generatedLine,
+              column: map.generatedColumn,
+            },
+            original: {
+              line: map.originalLine,
+              column: map.originalColumn,
+            },
+            source: map.source,
+            name: map.name,
+          },
+    );
   });
 
   return rawMappings;