diff --git a/std/math/fabs.zig b/std/math/fabs.zig
index 821624e1bc..ae8f9616a8 100644
--- a/std/math/fabs.zig
+++ b/std/math/fabs.zig
@@ -10,12 +10,19 @@ const assert = std.debug.assert;
 pub fn fabs(x: var) @typeOf(x) {
     const T = @typeOf(x);
     return switch (T) {
+        f16 => fabs16(x),
         f32 => fabs32(x),
         f64 => fabs64(x),
         else => @compileError("fabs not implemented for " ++ @typeName(T)),
     };
 }
 
+fn fabs16(x: f16) f16 {
+    var u = @bitCast(u16, x);
+    u &= 0x7FFF;
+    return @bitCast(f16, u);
+}
+
 fn fabs32(x: f32) f32 {
     var u = @bitCast(u32, x);
     u &= 0x7FFFFFFF;
@@ -29,10 +36,16 @@ fn fabs64(x: f64) f64 {
 }
 
 test "math.fabs" {
+    assert(fabs(f16(1.0)) == fabs16(1.0));
     assert(fabs(f32(1.0)) == fabs32(1.0));
     assert(fabs(f64(1.0)) == fabs64(1.0));
 }
 
+test "math.fabs16" {
+    assert(fabs16(1.0) == 1.0);
+    assert(fabs16(-1.0) == 1.0);
+}
+
 test "math.fabs32" {
     assert(fabs32(1.0) == 1.0);
     assert(fabs32(-1.0) == 1.0);
@@ -43,6 +56,12 @@ test "math.fabs64" {
     assert(fabs64(-1.0) == 1.0);
 }
 
+test "math.fabs16.special" {
+    assert(math.isPositiveInf(fabs(math.inf(f16))));
+    assert(math.isPositiveInf(fabs(-math.inf(f16))));
+    assert(math.isNan(fabs(math.nan(f16))));
+}
+
 test "math.fabs32.special" {
     assert(math.isPositiveInf(fabs(math.inf(f32))));
     assert(math.isPositiveInf(fabs(-math.inf(f32))));