diff --git a/apex/builder.go b/apex/builder.go
index 3c7671b..f49bed9 100644
--- a/apex/builder.go
+++ b/apex/builder.go
@@ -275,6 +275,22 @@
 
 	manifestJsonFullOut := android.PathForModuleOut(ctx, "apex_manifest_full.json")
 	defaultVersion := android.DefaultUpdatableModuleVersion
+	if a.properties.Variant_version != nil {
+		defaultVersionInt, err := strconv.Atoi(defaultVersion)
+		if err != nil {
+			ctx.ModuleErrorf("expected DefaultUpdatableModuleVersion to be an int, but got %s", defaultVersion)
+		}
+		if defaultVersionInt%10 != 0 {
+			ctx.ModuleErrorf("expected DefaultUpdatableModuleVersion to end in a zero, but got %s", defaultVersion)
+		}
+		variantVersion := []rune(*a.properties.Variant_version)
+		if len(variantVersion) != 1 || variantVersion[0] < '0' || variantVersion[0] > '9' {
+			ctx.PropertyErrorf("variant_version", "expected an integer between 0-9; got %s", *a.properties.Variant_version)
+		}
+		defaultVersionRunes := []rune(defaultVersion)
+		defaultVersionRunes[len(defaultVersion)-1] = []rune(variantVersion)[0]
+		defaultVersion = string(defaultVersionRunes)
+	}
 	if override := ctx.Config().Getenv("OVERRIDE_APEX_MANIFEST_DEFAULT_VERSION"); override != "" {
 		defaultVersion = override
 	}