diff --git a/examples/typescript-sql-on-fhir/generate.ts b/examples/typescript-sql-on-fhir/generate.ts
index 32b5a4bb7..269e15040 100644
--- a/examples/typescript-sql-on-fhir/generate.ts
+++ b/examples/typescript-sql-on-fhir/generate.ts
@@ -3,6 +3,9 @@ import { APIBuilder, prettyReport } from "../../src/api/builder";
 const builder = new APIBuilder()
     .throwException()
     .typescript({ withDebugComment: false, generateProfile: false })
+    // The IG references R5 core resources (e.g. ViewDefinition's base chain reaches Library)
+    // but doesn't declare an hl7.fhir.r5.core dependency, so add it explicitly to resolve them.
+    .fromPackage("hl7.fhir.r5.core", "5.0.0")
     .fromPackageRef("https://build.fhir.org/ig/FHIR/sql-on-fhir-v2/package.tgz")
     .outputTo("./examples/typescript-sql-on-fhir/fhir-types")
     .introspection({ typeTree: "tree.yaml" })
diff --git a/test/api/write-generator/multi-package/sql-on-fhir.test.ts b/test/api/write-generator/multi-package/sql-on-fhir.test.ts
index 0c2bd7228..2f99142bb 100644
--- a/test/api/write-generator/multi-package/sql-on-fhir.test.ts
+++ b/test/api/write-generator/multi-package/sql-on-fhir.test.ts
@@ -5,10 +5,13 @@ import { mkSilentLogger } from "@typeschema-test/utils";
 
 /**
  * Tests for SQL-on-FHIR package.
- * The SQL-on-FHIR package depends on hl7.fhir.r5.core.
+ * The IG targets FHIR R5 and references R5 core resources (e.g. the ViewDefinition base
+ * chain reaches `Library`), but its package does not declare an `hl7.fhir.r5.core`
+ * dependency — so we add it explicitly, otherwise those R5 bases fail to resolve.
  */
 describe("SQL-on-FHIR", async () => {
     const packageUrl = "https://build.fhir.org/ig/FHIR/sql-on-fhir-v2/package.tgz";
+    const r5Core = { name: "hl7.fhir.r5.core", version: "5.0.0" };
 
     const treeShakeConfig = {
         "org.sql-on-fhir.ig": {
@@ -22,6 +25,7 @@ describe("SQL-on-FHIR", async () => {
 
     describe("TypeScript Generation", async () => {
         const result = await new APIBuilder({ logger: mkSilentLogger() })
+            .fromPackage(r5Core.name, r5Core.version)
             .fromPackageRef(packageUrl)
             .typeSchema({ treeShake: treeShakeConfig })
             .typescript({ inMemoryOnly: true })
@@ -57,6 +61,7 @@ describe("SQL-on-FHIR", async () => {
 
     describe("Python Generation", async () => {
         const result = await new APIBuilder({ logger: mkSilentLogger() })
+            .fromPackage(r5Core.name, r5Core.version)
             .fromPackageRef(packageUrl)
             .typeSchema({ treeShake: treeShakeConfig, promoteLogical: promoteLogicalConfig })
             .python({ inMemoryOnly: true })
@@ -87,6 +92,7 @@ describe("SQL-on-FHIR", async () => {
 
     describe("C# Generation", async () => {
         const result = await new APIBuilder({ logger: mkSilentLogger() })
+            .fromPackage(r5Core.name, r5Core.version)
             .fromPackageRef(packageUrl)
             .typeSchema({ treeShake: treeShakeConfig, promoteLogical: promoteLogicalConfig })
             .csharp({ inMemoryOnly: true })