diff --git a/src/sdk/build/Vezel.Zig.Sdk.Build.targets b/src/sdk/build/Vezel.Zig.Sdk.Build.targets
index c8d7b03..4707556 100644
--- a/src/sdk/build/Vezel.Zig.Sdk.Build.targets
+++ b/src/sdk/build/Vezel.Zig.Sdk.Build.targets
@@ -39,6 +39,9 @@
         <CallTarget Targets="$(_FormatTarget)"
                     Condition="'$(_FormatTarget)' != ''" />
 
+        <Error Text="No source files in project."
+               Condition="@(Compile->Count()) == 0" />
+
         <ZigCompile AccessControl="$(AccessControl)"
                     BlockExtensions="$(BlockExtensions)"
                     CommandFragmentsDirectory="$(_CommandFragmentsPath)"
diff --git a/src/sdk/build/Vezel.Zig.Sdk.Format.targets b/src/sdk/build/Vezel.Zig.Sdk.Format.targets
index cccdea5..4a73d21 100644
--- a/src/sdk/build/Vezel.Zig.Sdk.Format.targets
+++ b/src/sdk/build/Vezel.Zig.Sdk.Format.targets
@@ -1,6 +1,6 @@
 <Project>
     <Target Name="_CheckFormat"
-            Condition="'$(CompilerMode)' == 'Zig'">
+            Condition="'$(CompilerMode)' == 'Zig' and @(ZigSource->Count()) != 0">
         <ZigFormat FormatterMode="Check"
                    Sources="@(ZigSource)"
                    StandardOutputImportance="high"
@@ -8,7 +8,7 @@
     </Target>
 
     <Target Name="Format"
-            Condition="'$(CompilerMode)' == 'Zig'">
+            Condition="'$(CompilerMode)' == 'Zig' and @(ZigSource->Count()) != 0">
         <ZigFormat FormatterMode="Execute"
                    Sources="@(ZigSource)"
                    ToolExe="$(ZigExePath)" />