diff --git a/libclc/generic/include/clc/math/trunc.h b/libclc/generic/include/clc/math/trunc.h
index d34f66190433..e8cc1f812e4a 100644
--- a/libclc/generic/include/clc/math/trunc.h
+++ b/libclc/generic/include/clc/math/trunc.h
@@ -1,9 +1,7 @@
-#undef trunc
-#define trunc __clc_trunc
+#define __CLC_BODY <clc/math/unary_decl.inc>
+#define __CLC_FUNCTION trunc
 
-#define __CLC_FUNCTION __clc_trunc
-#define __CLC_INTRINSIC "llvm.trunc"
-#include <clc/math/unary_intrin.inc>
+#include <clc/math/gentype.inc>
 
+#undef __CLC_BODY
 #undef __CLC_FUNCTION
-#undef __CLC_INTRINSIC
diff --git a/libclc/generic/lib/SOURCES b/libclc/generic/lib/SOURCES
index a54aa8a02fbb..df7f68f040f3 100644
--- a/libclc/generic/lib/SOURCES
+++ b/libclc/generic/lib/SOURCES
@@ -189,6 +189,7 @@ math/tanh.cl
 math/clc_tanpi.cl
 math/tanpi.cl
 math/tgamma.cl
+math/trunc.cl
 misc/shuffle.cl
 misc/shuffle2.cl
 relational/all.cl
diff --git a/libclc/generic/lib/math/trunc.cl b/libclc/generic/lib/math/trunc.cl
new file mode 100644
index 000000000000..930bf78d234c
--- /dev/null
+++ b/libclc/generic/lib/math/trunc.cl
@@ -0,0 +1,10 @@
+#include <clc/clc.h>
+
+// Map the llvm intrinsic to an OpenCL function.
+#define __CLC_FUNCTION __clc_trunc
+#define __CLC_INTRINSIC "llvm.trunc"
+#include <clc/math/unary_intrin.inc>
+
+#undef __CLC_FUNCTION
+#define __CLC_FUNCTION trunc
+#include "unary_builtin.inc"