diff --git a/travis/test/immwarn-no.bin.t b/travis/test/immwarn-no.bin.t
new file mode 100644
index 000000000..3896674ee
Binary files /dev/null and b/travis/test/immwarn-no.bin.t differ
diff --git a/travis/test/immwarn-o.bin.t b/travis/test/immwarn-o.bin.t
new file mode 100644
index 000000000..39723cd1b
Binary files /dev/null and b/travis/test/immwarn-o.bin.t differ
diff --git a/travis/test/immwarn-o.stderr b/travis/test/immwarn-o.stderr
new file mode 100644
index 000000000..66291360a
--- /dev/null
+++ b/travis/test/immwarn-o.stderr
@@ -0,0 +1,10 @@
+./travis/test/immwarn.asm:13: warning: word value exceeds bounds [-w+number-overflow]
+./travis/test/immwarn.asm:21: warning: word value exceeds bounds [-w+number-overflow]
+./travis/test/immwarn.asm:26: warning: signed byte value exceeds bounds [-w+number-overflow]
+./travis/test/immwarn.asm:32: warning: word value exceeds bounds [-w+number-overflow]
+./travis/test/immwarn.asm:37: warning: signed byte value exceeds bounds [-w+number-overflow]
+./travis/test/immwarn.asm:49: warning: signed byte value exceeds bounds [-w+number-overflow]
+./travis/test/immwarn.asm:75: warning: signed dword immediate exceeds bounds [-w+number-overflow]
+./travis/test/immwarn.asm:75: warning: dword data exceeds bounds [-w+number-overflow]
+./travis/test/immwarn.asm:79: warning: signed dword value exceeds bounds [-w+number-overflow]
+./travis/test/immwarn.asm:89: warning: signed byte value exceeds bounds [-w+number-overflow]
\ No newline at end of file
diff --git a/travis/test/immwarn-ono.bin.t b/travis/test/immwarn-ono.bin.t
new file mode 100644
index 000000000..a1dd76acb
Binary files /dev/null and b/travis/test/immwarn-ono.bin.t differ
diff --git a/travis/test/immwarn.asm b/travis/test/immwarn.asm
new file mode 100644
index 000000000..8bffbfae8
--- /dev/null
+++ b/travis/test/immwarn.asm
@@ -0,0 +1,91 @@
+;Testname=onowarn; Arguments=-Ox -DOPT=1 -DWARN=0 -fbin -oimmwarn.bin; Files=stdout stderr immwarn.bin
+;Testname=owarn; Arguments=-Ox -DOPT=1 -DWARN=1 -fbin -oimmwarn.bin; Files=stdout stderr immwarn.bin
+;Testname=nowarn; Arguments=-O0 -DOPT=0 -DWARN=0 -fbin -oimmwarn.bin; Files=stdout stderr immwarn.bin
+;Testname=warn; Arguments=-O0 -DOPT=1 -DWARN=1 -fbin -oimmwarn.bin; Files=stdout stderr immwarn.bin
+
+%ifndef WARN
+  %define WARN 1
+%endif
+
+	bits 16
+	push 1
+%if WARN
+	push 0ffffffffh
+%endif
+	push -1
+	push 0ffffh
+	push byte 0FFFFh
+
+	add ax,0FFFFh
+%if WARN
+	add ax,0FFFFFFFFh
+%endif
+	add ax,-1
+	add ax,byte 0FFFFh
+%if WARN
+	add ax,byte 0FFFFFFFFh
+%endif
+	add ax,-1
+
+	add cx,0FFFFh
+%if WARN
+	add cx,0FFFFFFFFh
+%endif
+	add cx,-1
+	add cx,byte 0FFFFh
+%if WARN
+	add cx,byte 0FFFFFFFFh
+%endif
+	add cx,-1
+
+	bits 32
+	push 1
+	push 0ffffffffh
+	push -1
+	push 0ffffh
+
+	push byte 1
+%if WARN
+	push byte 0ffffh
+%endif
+	push byte -1
+
+	push word 1
+	push word 0ffffh
+	push word -1
+
+	push dword 1
+	push dword 0ffffffffh
+	push dword -1
+
+	add eax,0FFFFh
+	add eax,0FFFFFFFFh
+	add eax,-1
+
+	add ecx,0FFFFh
+	add ecx,0FFFFFFFFh
+	add ecx,-1
+
+	bits 64
+	mov eax,7fffffffh
+	mov eax,80000000h
+	mov rax,7fffffffh
+	mov rax,80000000h
+%if WARN
+	mov rax,dword 80000000h
+%endif
+	add rcx,0FFFFh
+%if WARN
+	add rcx,0FFFFFFFFh
+%endif
+	add rcx,-1
+
+	add ecx,0FFFFh
+	add ecx,0FFFFFFFFh
+	add ecx,-1
+
+	push byte 1
+%if WARN
+	push byte 0ffffffffh
+%endif
+	push byte -1
diff --git a/travis/test/immwarn.bin.t b/travis/test/immwarn.bin.t
new file mode 100644
index 000000000..71d1dc36f
Binary files /dev/null and b/travis/test/immwarn.bin.t differ
diff --git a/travis/test/immwarn.json b/travis/test/immwarn.json
new file mode 100644
index 000000000..9a8203184
--- /dev/null
+++ b/travis/test/immwarn.json
@@ -0,0 +1,38 @@
+[
+	{
+		"description": "Test warns on immediate operands (-O0, warn)",
+		"id": "immwarn",
+		"format": "bin",
+		"source": "immwarn.asm",
+		"option": "-O0 -DOPT=1 -DWARN=1",
+		"target": [
+			{ "output": "immwarn.bin" },
+			{ "stderr": "immwarn.stderr" }
+		]
+	},
+	{
+		"description": "Test warns on immediate operands (-O0, nowarn)",
+		"ref": "immwarn",
+		"option": "-O0 -DOPT=1 -DWARN=0",
+		"target": [
+			{ "output": "immwarn-no.bin" }
+		]
+	},
+	{
+		"description": "Test warns on immediate operands (-Ox, warn)",
+		"ref": "immwarn",
+		"option": "-Ox -DOPT=1 -DWARN=1",
+		"target": [
+			{ "output": "immwarn-o.bin" },
+			{ "stderr": "immwarn-o.stderr" }
+		]
+	},
+	{
+		"description": "Test warns on immediate operands (-Ox, nowarn)",
+		"ref": "immwarn",
+		"option": "-Ox -DOPT=1 -DWARN=0",
+		"target": [
+			{ "output": "immwarn-ono.bin" }
+		]
+	}
+]
diff --git a/travis/test/immwarn.stderr b/travis/test/immwarn.stderr
new file mode 100644
index 000000000..95f344880
--- /dev/null
+++ b/travis/test/immwarn.stderr
@@ -0,0 +1,11 @@
+./travis/test/immwarn.asm:13: warning: word data exceeds bounds [-w+number-overflow]
+./travis/test/immwarn.asm:21: warning: word data exceeds bounds [-w+number-overflow]
+./travis/test/immwarn.asm:26: warning: signed byte value exceeds bounds [-w+number-overflow]
+./travis/test/immwarn.asm:32: warning: word data exceeds bounds [-w+number-overflow]
+./travis/test/immwarn.asm:37: warning: signed byte value exceeds bounds [-w+number-overflow]
+./travis/test/immwarn.asm:49: warning: signed byte value exceeds bounds [-w+number-overflow]
+./travis/test/immwarn.asm:75: warning: signed dword immediate exceeds bounds [-w+number-overflow]
+./travis/test/immwarn.asm:75: warning: dword data exceeds bounds [-w+number-overflow]
+./travis/test/immwarn.asm:79: warning: signed dword immediate exceeds bounds [-w+number-overflow]
+./travis/test/immwarn.asm:79: warning: dword data exceeds bounds [-w+number-overflow]
+./travis/test/immwarn.asm:89: warning: signed byte value exceeds bounds [-w+number-overflow]
\ No newline at end of file