diff --git a/d2cli/export.go b/d2cli/export.go
index 68de3a193..6da34bdb8 100644
--- a/d2cli/export.go
+++ b/d2cli/export.go
@@ -9,11 +9,10 @@ type exportExtension string
 const GIF exportExtension = ".gif"
 const PNG exportExtension = ".png"
 const PPTX exportExtension = ".pptx"
-const PPT exportExtension = ".ppt"
 const PDF exportExtension = ".pdf"
 const SVG exportExtension = ".svg"
 
-var SUPPORTED_EXTENSIONS = []exportExtension{SVG, PNG, PDF, PPTX, GIF, PPT}
+var SUPPORTED_EXTENSIONS = []exportExtension{SVG, PNG, PDF, PPTX, GIF}
 
 func getExportExtension(outputPath string) exportExtension {
 	ext := filepath.Ext(outputPath)
diff --git a/d2cli/export_test.go b/d2cli/export_test.go
index b8f10ae19..eb7ac44ee 100644
--- a/d2cli/export_test.go
+++ b/d2cli/export_test.go
@@ -57,14 +57,6 @@ func TestOutputFormat(t *testing.T) {
 			requiresAnimationInterval: false,
 			requiresPngRender:         true,
 		},
-		{
-			outputPath:                "/out.ppt",
-			extension:                 PPT,
-			supportsDarkTheme:         false,
-			supportsAnimation:         false,
-			requiresAnimationInterval: false,
-			requiresPngRender:         false,
-		},
 		{
 			outputPath:                "/out.pdf",
 			extension:                 PDF,
diff --git a/d2cli/main.go b/d2cli/main.go
index a4f83686b..172559d3c 100644
--- a/d2cli/main.go
+++ b/d2cli/main.go
@@ -187,10 +187,10 @@ func Run(ctx context.Context, ms *xmain.State) (err error) {
 			inputPath = filepath.Join(inputPath, "index.d2")
 		}
 	}
-	outputFormat := getExportExtension(outputPath)
-	if outputFormat == PPT {
+	if filepath.Ext(outputPath) == ".ppt" {
 		return xmain.UsageErrorf("D2 does not support ppt exports, did you mean \"pptx\"?")
 	}
+	outputFormat := getExportExtension(outputPath)
 	if outputPath != "-" {
 		outputPath = ms.AbsPath(outputPath)
 		if *animateIntervalFlag > 0 && !outputFormat.supportsAnimation() {