diff --git a/src/css/render.ts b/src/css/render.ts
index e07d05b..747b328 100644
--- a/src/css/render.ts
+++ b/src/css/render.ts
@@ -31,7 +31,7 @@ export async function generateFontFallbacks (family: string, data: NormalizedFon
   for (const fallback of fallbacks) {
     css.push(generateFallbackFontFace(metrics, {
       ...fallback,
-      metrics: await getMetricsForFamily(fallback.name) || undefined
+      metrics: await getMetricsForFamily(fallback.font) || undefined
     }))
   }
   return css
diff --git a/test/basic.test.ts b/test/basic.test.ts
index f9b443a..d3dc170 100644
--- a/test/basic.test.ts
+++ b/test/basic.test.ts
@@ -120,9 +120,9 @@ describe('features', () => {
         "@font-face {
         font-family: "Lato Fallback: Arial";
         src: local("Arial");
-        size-adjust: 100%;
-        ascent-override: 98.7%;
-        descent-override: 21.3%;
+        size-adjust: 97.4159%;
+        ascent-override: 101.3181%;
+        descent-override: 21.865%;
         line-gap-override: 0%;
       }",
       ]
@@ -132,9 +132,9 @@ describe('features', () => {
         "@font-face {
         font-family: "Nunito Fallback: Arial";
         src: local("Arial");
-        size-adjust: 100%;
-        ascent-override: 101.1%;
-        descent-override: 35.3%;
+        size-adjust: 101.7204%;
+        ascent-override: 99.3901%;
+        descent-override: 34.703%;
         line-gap-override: 0%;
       }",
       ]
@@ -148,9 +148,9 @@ describe('features', () => {
         "@font-face {
         font-family: "Oswald Fallback: Times New Roman";
         src: local("Times New Roman");
-        size-adjust: 100%;
-        ascent-override: 119.3%;
-        descent-override: 28.9%;
+        size-adjust: 90.5221%;
+        ascent-override: 131.791%;
+        descent-override: 31.9259%;
         line-gap-override: 0%;
       }",
       ]
@@ -160,9 +160,9 @@ describe('features', () => {
         "@font-face {
         font-family: "Fredoka Fallback: Tahoma";
         src: local("Tahoma");
-        size-adjust: 100%;
-        ascent-override: 97.4%;
-        descent-override: 23.6%;
+        size-adjust: 101.2772%;
+        ascent-override: 96.1717%;
+        descent-override: 23.3024%;
         line-gap-override: 0%;
       }",
       ]
diff --git a/test/parse.test.ts b/test/parse.test.ts
index 104661b..6a1e244 100644
--- a/test/parse.test.ts
+++ b/test/parse.test.ts
@@ -23,9 +23,9 @@ describe('parsing', () => {
         "@font-face {
           font-family: "Open Sans Fallback: Times New Roman";
           src: local("Times New Roman");
-          size-adjust: 100%;
-          ascent-override: 106.8848%;
-          descent-override: 29.2969%;
+          size-adjust: 116.6056%;
+          ascent-override: 91.6635%;
+          descent-override: 25.1248%;
           line-gap-override: 0%;
         }
 
@@ -82,19 +82,19 @@ describe('parsing', () => {
         "@font-face {
           font-family: "Poppins Fallback: Arial";
           src: local("Arial");
-          size-adjust: 100%;
-          ascent-override: 105%;
-          descent-override: 35%;
-          line-gap-override: 10%;
+          size-adjust: 113.7274%;
+          ascent-override: 92.326%;
+          descent-override: 30.7753%;
+          line-gap-override: 8.793%;
         }
 
         @font-face {
           font-family: "Poppins Fallback: Times New Roman";
           src: local("Times New Roman");
-          size-adjust: 100%;
-          ascent-override: 105%;
-          descent-override: 35%;
-          line-gap-override: 10%;
+          size-adjust: 125.5306%;
+          ascent-override: 83.6449%;
+          descent-override: 27.8816%;
+          line-gap-override: 7.9662%;
         }
 
         @font-face {