diff --git a/src/namedef.h b/src/namedef.h
index 83f4aca9b..5478349e6 100644
--- a/src/namedef.h
+++ b/src/namedef.h
@@ -284,8 +284,18 @@ xx(FRandom)
 xx(Random2)
 xx(RandomPick)
 xx(FRandomPick)
+xx(Exp)
+xx(Log10)
+xx(Ceil)
+xx(ACos)
+xx(ASin)
+xx(ATan)
 xx(Cos)
 xx(Sin)
+xx(Tan)
+xx(CosH)
+xx(SinH)
+xx(TanH)
 xx(Alpha)
 xx(Angle)
 xx(Args)
diff --git a/src/thingdef/thingdef_expression.cpp b/src/thingdef/thingdef_expression.cpp
index 7d18bce59..2ac41f7a8 100644
--- a/src/thingdef/thingdef_expression.cpp
+++ b/src/thingdef/thingdef_expression.cpp
@@ -65,9 +65,23 @@ struct FLOP
 // degrees to radians for those that work with angles.
 static const FLOP FxFlops[] =
 {
+	{ NAME_Exp,		FLOP_EXP,		[](double v) { return exp(v); } },
+	{ NAME_Log,		FLOP_LOG,		[](double v) { return log(v); } },
+	{ NAME_Log10,	FLOP_LOG10,		[](double v) { return log10(v); } },
 	{ NAME_Sqrt,	FLOP_SQRT,		[](double v) { return sqrt(v); } },
+	{ NAME_Ceil,	FLOP_CEIL,		[](double v) { return ceil(v); } },
+	{ NAME_Floor,	FLOP_FLOOR,		[](double v) { return floor(v); } },
+
+	{ NAME_ACos,	FLOP_ACOS_DEG,	[](double v) { return acos(v) * (180.0 / M_PI); } },
+	{ NAME_ASin,	FLOP_ASIN_DEG,	[](double v) { return asin(v) * (180.0 / M_PI); } },
+	{ NAME_ATan,	FLOP_ATAN_DEG,	[](double v) { return atan(v) * (180.0 / M_PI); } },
 	{ NAME_Cos,		FLOP_COS_DEG,	[](double v) { return cos(v * (M_PI / 180.0)); } },
 	{ NAME_Sin,		FLOP_SIN_DEG,	[](double v) { return sin(v * (M_PI / 180.0)); } },
+	{ NAME_Tan,		FLOP_TAN_DEG,	[](double v) { return tan(v * (M_PI / 180.0)); } },
+
+	{ NAME_CosH,	FLOP_COSH,		[](double v) { return cosh(v); } },
+	{ NAME_SinH,	FLOP_SINH,		[](double v) { return sinh(v); } },
+	{ NAME_TanH,	FLOP_TANH,		[](double v) { return tanh(v); } },
 };
 
 ExpEmit::ExpEmit(VMFunctionBuilder *build, int type)
@@ -3162,8 +3176,6 @@ FxFunctionCall::~FxFunctionCall()
 
 FxExpression *FxFunctionCall::Resolve(FCompileContext& ctx)
 {
-	// There's currently only 3 global functions.
-	// If this changes later, it won't be here!
 	for (int i = 0; i < countof(FxFlops); ++i)
 	{
 		if (MethodName == FxFlops[i].Name)