diff --git a/py2wasm/compiler.py b/py2wasm/compiler.py
index eba158c..d04bb2c 100644
--- a/py2wasm/compiler.py
+++ b/py2wasm/compiler.py
@@ -87,6 +87,20 @@ def expression(inp: ourlang.Expression) -> Statements:
 
         raise NotImplementedError(expression, inp.type, inp.operator)
 
+    if isinstance(inp, ourlang.UnaryOp):
+        yield from expression(inp.right)
+
+        if isinstance(inp.type, ourlang.OurTypeFloat32):
+            if inp.operator in ourlang.WEBASSEMBLY_BUILDIN_FLOAT_OPS:
+                yield wasm.Statement(f'f32.{inp.operator}')
+                return
+        if isinstance(inp.type, ourlang.OurTypeFloat64):
+            if inp.operator in ourlang.WEBASSEMBLY_BUILDIN_FLOAT_OPS:
+                yield wasm.Statement(f'f64.{inp.operator}')
+                return
+
+        raise NotImplementedError(expression, inp.type, inp.operator)
+
     if isinstance(inp, ourlang.FunctionCall):
         for arg in inp.arguments:
             yield from expression(arg)
diff --git a/py2wasm/ourlang.py b/py2wasm/ourlang.py
index 0d53280..1855e21 100644
--- a/py2wasm/ourlang.py
+++ b/py2wasm/ourlang.py
@@ -5,6 +5,10 @@ from typing import Any, Dict, List, Optional, NoReturn, Union, Tuple
 
 import ast
 
+from typing_extensions import Final
+
+WEBASSEMBLY_BUILDIN_FLOAT_OPS: Final = ('abs', 'sqrt', 'ceil', 'floor', 'trunc', 'nearest', )
+
 class OurType:
     """
     Type base class
@@ -224,6 +228,9 @@ class UnaryOp(Expression):
         self.right = right
 
     def render(self) -> str:
+        if self.operator in WEBASSEMBLY_BUILDIN_FLOAT_OPS:
+            return f'{self.operator}({self.right.render()})'
+
         return f'{self.operator}{self.right.render()}'
 
 class FunctionCall(Expression):
@@ -523,15 +530,6 @@ class Module:
         self.functions = {}
         self.structs = {}
 
-        # sqrt is guaranteed by wasm, so we should provide it
-        # ATM it's a 32 bit variant, but that might change.
-        # TODO: Could be a UnaryOp?
-        sqrt = Function('sqrt', -2)
-        sqrt.buildin = True
-        sqrt.returns = self.types['f32']
-        sqrt.posonlyargs = [('@', self.types['f32'], )]
-        # self.functions[sqrt.name] = sqrt
-
     def render(self) -> str:
         """
         Renders the module back to source code format
@@ -834,7 +832,7 @@ class OurVisitor:
 
         raise NotImplementedError(f'{node} as expr in FunctionDef')
 
-    def visit_Module_FunctionDef_Call(self, module: Module, function: Function, our_locals: OurLocals, exp_type: OurType, node: ast.Call) -> FunctionCall:
+    def visit_Module_FunctionDef_Call(self, module: Module, function: Function, our_locals: OurLocals, exp_type: OurType, node: ast.Call) -> Union[FunctionCall, UnaryOp]:
         if node.keywords:
             _raise_static_error(node, 'Keyword calling not supported') # Yet?
 
@@ -848,6 +846,18 @@ class OurVisitor:
             struct_constructor = StructConstructor(struct)
 
             func = module.functions[struct_constructor.name]
+        elif node.func.id in WEBASSEMBLY_BUILDIN_FLOAT_OPS:
+            if not isinstance(exp_type, (OurTypeFloat32, OurTypeFloat64, )):
+                _raise_static_error(node, f'Cannot make square root result in {exp_type}')
+
+            if 1 != len(node.args):
+                _raise_static_error(node, f'Function {node.func.id} requires 1 arguments but {len(node.args)} are given')
+
+            return UnaryOp(
+                exp_type,
+                'sqrt',
+                self.visit_Module_FunctionDef_expr(module, function, our_locals, exp_type, node.args[0]),
+            )
         else:
             if node.func.id not in module.functions:
                 _raise_static_error(node, 'Call to undefined function')