diff --git a/bp2build/build_conversion.go b/bp2build/build_conversion.go
index 4de5aae..a1e0424 100644
--- a/bp2build/build_conversion.go
+++ b/bp2build/build_conversion.go
@@ -488,6 +488,9 @@
 		ret = "{\n"
 		// Sort and print the struct props by the key.
 		structProps := extractStructProperties(propertyValue, indent)
+		if len(structProps) == 0 {
+			return "", nil
+		}
 		for _, k := range android.SortedStringKeys(structProps) {
 			ret += makeIndent(indent + 1)
 			ret += fmt.Sprintf("%q: %s,\n", k, structProps[k])