diff --git a/stdlib/internal/c_stubs.codon b/stdlib/internal/c_stubs.codon
index 6a292850..21cddd15 100644
--- a/stdlib/internal/c_stubs.codon
+++ b/stdlib/internal/c_stubs.codon
@@ -223,6 +223,11 @@ def log10(a: float) -> float:
 def sqrt(a: float) -> float:
     pass
 
+@pure
+@C
+def cbrt(a: float) -> float:
+    pass
+
 @pure
 @C
 def pow(a: float, b: float) -> float:
@@ -413,6 +418,11 @@ def log10f(a: float32) -> float32:
 def sqrtf(a: float32) -> float32:
     pass
 
+@pure
+@C
+def cbrtf(a: float32) -> float32:
+    pass
+
 @pure
 @C
 def powf(a: float32, b: float32) -> float32: