diff --git a/src/formats/jpeg.c b/src/formats/jpeg.c
index 9f60de7..b0aadfd 100644
--- a/src/formats/jpeg.c
+++ b/src/formats/jpeg.c
@@ -76,7 +76,8 @@ enum loader_status decode_jpeg(struct image* ctx, const uint8_t* data,
             uint32_t* pixel = (uint32_t*)line;
             for (int x = jpg.output_width - 1; x >= 0; --x) {
                 const uint8_t src = *(line + x);
-                pixel[x] = (0xff << 24) | src << 16 | src << 8 | src;
+                pixel[x] = ((argb_t)0xff << 24) | (argb_t)src << 16 |
+                    (argb_t)src << 8 | src;
             }
         }
 
@@ -86,7 +87,8 @@ enum loader_status decode_jpeg(struct image* ctx, const uint8_t* data,
             uint32_t* pixel = (uint32_t*)line;
             for (int x = jpg.output_width - 1; x >= 0; --x) {
                 const uint8_t* src = line + x * 3;
-                pixel[x] = (0xff << 24) | src[0] << 16 | src[1] << 8 | src[2];
+                pixel[x] = ((argb_t)0xff << 24) | (argb_t)src[0] << 16 |
+                    (argb_t)src[1] << 8 | src[2];
             }
         }
 #endif // LIBJPEG_TURBO_VERSION
diff --git a/src/pixmap.h b/src/pixmap.h
index c063756..c21162e 100644
--- a/src/pixmap.h
+++ b/src/pixmap.h
@@ -25,10 +25,10 @@ typedef uint32_t argb_t;
 #define ARGB_GET_B(c) (((c) >> ARGB_B_SHIFT) & 0xff)
 
 // create argb_t from channel value
-#define ARGB_SET_A(a) (((a) & 0xff) << ARGB_A_SHIFT)
-#define ARGB_SET_R(r) (((r) & 0xff) << ARGB_R_SHIFT)
-#define ARGB_SET_G(g) (((g) & 0xff) << ARGB_G_SHIFT)
-#define ARGB_SET_B(b) (((b) & 0xff) << ARGB_B_SHIFT)
+#define ARGB_SET_A(a) (((argb_t)(a) & 0xff) << ARGB_A_SHIFT)
+#define ARGB_SET_R(r) (((argb_t)(r) & 0xff) << ARGB_R_SHIFT)
+#define ARGB_SET_G(g) (((argb_t)(g) & 0xff) << ARGB_G_SHIFT)
+#define ARGB_SET_B(b) (((argb_t)(b) & 0xff) << ARGB_B_SHIFT)
 
 // convert ABGR to ARGB
 #define ABGR_TO_ARGB(c) \