diff --git a/.github/workflows/compiler-test.yml b/.github/workflows/compiler-test.yml
index 9d44fc0634..face818642 100644
--- a/.github/workflows/compiler-test.yml
+++ b/.github/workflows/compiler-test.yml
@@ -75,7 +75,7 @@ jobs:
         ref: dev
         path: nebula
     - name: Compile Nebula Dev
-      run: main\bin\DMCompiler\DMCompiler.exe nebula\nebula.dme --suppress-unimplemented
+      run: main\bin\DMCompiler\DMCompiler.exe nebula\nebula.dme --suppress-unimplemented --version=516.1655
     - name: Checkout /vg/station Master
       uses: actions/checkout@v2
       with:
@@ -83,7 +83,7 @@ jobs:
         ref: Bleeding-Edge
         path: vg
     - name: Compile /vg/station Master
-      run: main\bin\DMCompiler\DMCompiler.exe vg\vgstation13.dme --suppress-unimplemented
+      run: main\bin\DMCompiler\DMCompiler.exe vg\vgstation13.dme --suppress-unimplemented --version=516.1655
     - name: Checkout CM Master
       uses: actions/checkout@v2
       with:
@@ -99,4 +99,4 @@ jobs:
         ref: master
         path: aurora
     - name: Compile Aurora Master
-      run: main\bin\DMCompiler\DMCompiler.exe aurora\aurorastation.dme --suppress-unimplemented
+      run: main\bin\DMCompiler\DMCompiler.exe aurora\aurorastation.dme --suppress-unimplemented --version=516.1655
diff --git a/Content.Tests/DMProject/Tests/Builtins/sign.dm b/Content.Tests/DMProject/Tests/Builtins/sign.dm
new file mode 100644
index 0000000000..26786f754d
--- /dev/null
+++ b/Content.Tests/DMProject/Tests/Builtins/sign.dm
@@ -0,0 +1,10 @@
+
+/proc/RunTest()
+	ASSERT(sign(5.2) == 1)
+	ASSERT(sign(-5.2) == -1)
+	ASSERT(sign(0) == 0)
+	ASSERT(sign(null) == 0)
+	ASSERT(sign("") == 0)
+	ASSERT(sign("foo") == 0)
+	ASSERT(sign(list(1)) == 0)
+	
\ No newline at end of file
diff --git a/DMCompiler/DMStandard/_Standard.dm b/DMCompiler/DMStandard/_Standard.dm
index 5eabf6be5a..80a283ea9e 100644
--- a/DMCompiler/DMStandard/_Standard.dm
+++ b/DMCompiler/DMStandard/_Standard.dm
@@ -83,6 +83,7 @@ proc/roll(ndice = 1, sides) as num
 proc/round(A, B) as num
 proc/sha1(input) as text|null
 proc/shutdown(Addr,Natural = 0)
+proc/sign(A) as num
 proc/sleep(Delay)
 proc/sorttext(T1, T2) as num
 proc/sorttextEx(T1, T2) as num
diff --git a/OpenDreamRuntime/Procs/Native/DreamProcNative.cs b/OpenDreamRuntime/Procs/Native/DreamProcNative.cs
index 45d9737617..d2020f15f3 100644
--- a/OpenDreamRuntime/Procs/Native/DreamProcNative.cs
+++ b/OpenDreamRuntime/Procs/Native/DreamProcNative.cs
@@ -84,6 +84,7 @@ public static void SetupNativeProcs(DreamObjectTree objectTree) {
         objectTree.SetGlobalNativeProc(DreamProcNativeRoot.NativeProc_round);
         objectTree.SetGlobalNativeProc(DreamProcNativeRoot.NativeProc_sha1);
         objectTree.SetGlobalNativeProc(DreamProcNativeRoot.NativeProc_shutdown);
+        objectTree.SetGlobalNativeProc(DreamProcNativeRoot.NativeProc_sign);
         objectTree.SetGlobalNativeProc(DreamProcNativeRoot.NativeProc_sleep);
         objectTree.SetGlobalNativeProc(DreamProcNativeRoot.NativeProc_sorttext);
         objectTree.SetGlobalNativeProc(DreamProcNativeRoot.NativeProc_sorttextEx);
diff --git a/OpenDreamRuntime/Procs/Native/DreamProcNativeRoot.cs b/OpenDreamRuntime/Procs/Native/DreamProcNativeRoot.cs
index e20346626c..75b9e96013 100644
--- a/OpenDreamRuntime/Procs/Native/DreamProcNativeRoot.cs
+++ b/OpenDreamRuntime/Procs/Native/DreamProcNativeRoot.cs
@@ -2425,6 +2425,22 @@ public static DreamValue NativeProc_shutdown(NativeProc.Bundle bundle, DreamObje
         return DreamValue.Null;
     }
 
+    [DreamProc("sign")]
+    [DreamProcParameter("A", Type = DreamValueTypeFlag.Float)]
+    public static DreamValue NativeProc_sign(NativeProc.Bundle bundle, DreamObject? src, DreamObject? usr) {
+        if (bundle.Arguments.Length != 1) throw new Exception($"expected 1 argument (found {bundle.Arguments.Length})");
+        DreamValue arg = bundle.GetArgument(0, "A");
+
+        // Any non-num returns 0
+        if (!arg.TryGetValueAsFloat(out var value)) return new DreamValue(0);
+
+        return value switch {
+            0 => new DreamValue(0),
+            < 0 => new DreamValue(-1),
+            _ => new DreamValue(1)
+        };
+    }
+
     [DreamProc("sleep")]
     [DreamProcParameter("Delay", Type = DreamValueTypeFlag.Float)]
     public static async Task<DreamValue> NativeProc_sleep(AsyncNativeProc.State state) {