diff --git a/src/units.typ b/src/units.typ
index 9d6c2ad..da8fed1 100644
--- a/src/units.typ
+++ b/src/units.typ
@@ -252,7 +252,9 @@
   if num-state.math {
     separator = $separator$
   }
-  if unit.numerator.first().at(0) in ("°", "′", "″", sym.degree, sym.prime, sym.prime.double) { 
+  
+  let angles = ("°", "′", "″", sym.degree, sym.prime, sym.prime.double)
+  if unit.numerator.len() > 0 and unit.numerator.at(0).at(0) in angles { 
     separator = none
   }
 
diff --git a/tests/zi/basic/ref/1.png b/tests/zi/basic/ref/1.png
index 5b21b2c..f4785ae 100644
Binary files a/tests/zi/basic/ref/1.png and b/tests/zi/basic/ref/1.png differ
diff --git a/tests/zi/basic/test.typ b/tests/zi/basic/test.typ
index 4015b40..48c3766 100644
--- a/tests/zi/basic/test.typ
+++ b/tests/zi/basic/test.typ
@@ -12,6 +12,7 @@
 #zi.arcsecond[23] \
 #zi.kN[23] \
 #zi.degree[45] \
+#zi.declare("1/s")([2]) \
 
 #zi.kN() // later make them types maybe? Then we can just call #zi.kN, that looks much better