diff --git a/Jenkinsfile b/Jenkinsfile
index 9652c72..4c72ece 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -41,7 +41,7 @@ pipeline {
 					steps {
 						sh("git submodule update --init --recursive --force")
 						sh("make clean")
-						sh("make -j4 -f Makefile.watcom")
+						sh("make -j4 TARGET=watcom")
 						sh("mv taiga.exe taiga-win32.exe")
 						archiveArtifacts("taiga-win32.exe")
 					}
diff --git a/Makefile b/Makefile
index 5d6b0f3..1fdc5be 100644
--- a/Makefile
+++ b/Makefile
@@ -1,10 +1,12 @@
-CC ?= cc
-CFLAGS ?= -I external/xemil/include -I external/md4c/src -I external/stb -I src $(DEFS)
-LDFLAGS ?=
-LIBS ?=
-AFTER ?=
+CC = cc
+CFLAGS = -I external/xemil/include -I external/md4c/src -I external/stb -I src $(DEFS)
+LDFLAGS =
+LIBS =
+AFTER =
 
-E ?=
+E =
+
+-include Makefile.$(TARGET)
 
 .PHONY: all format clean
 
diff --git a/Makefile.watcom b/Makefile.watcom
index 8b76ae1..951a56a 100644
--- a/Makefile.watcom
+++ b/Makefile.watcom
@@ -1,7 +1,4 @@
 CC = owcc -bnt
-DEFS = -DSTBI_NO_SIMD
+DEFS += -DSTBI_NO_SIMD
 E = .exe
 AFTER = wrc -q -bt=nt src/taiga.rc taiga.exe
-LIBS =
-
-include Makefile