diff --git a/selfhost/cmd/wcc/cgenstmt.ww b/selfhost/cmd/wcc/cgenstmt.ww
index 6cac2f74..34b01c40 100644
--- a/selfhost/cmd/wcc/cgenstmt.ww
+++ b/selfhost/cmd/wcc/cgenstmt.ww
@@ -864,6 +864,26 @@ fn cglet(c: *cgen, n: *node) void = {
 				};
 			};
 		};
+		// 16B tuple init from a function call: SysV returns a
+		// 16-byte aggregate across the integer cursor (AX, DX). Spill
+		// BOTH eightbytes over the integer registers — an f64 element
+		// also rides its eightbyte in AX/DX here and is re-read from
+		// X0/XMM at field-read time, so no SSE cursor is needed (the
+		// f64 read is already byte-id). Mirror of cstage cgen.c:6652.
+		// Without this branch a 16B tuple receive (any element mix,
+		// incl. all-integer) fell to the generic single-word store
+		// below and dropped word1 — silent loss of t.1 (#102).
+		if (rettupleof(c, rhs) != nil && sz == 16) {
+			cgexpr(c, rhs);
+			emitline("\tMOVQ\tAX, ");
+			emitoff(off: i64);
+			emitline("(BP)\n");
+			emitline("\tMOVQ\tDX, ");
+			emitoff((off + 8): i64);
+			emitline("(BP)\n");
+			c.lastwasreturn = 0;
+			return;
+		};
 		// Array literal init: `let xs: [N]T = [a, b, c];` (or [_]T).
 		// Walk elements in declaration order, store each at off + i*esz
 		// using the right width for the element type. Trailing `...`