diff --git a/celt/arch.h b/celt/arch.h
index e8321ac8..53611e13 100644
--- a/celt/arch.h
+++ b/celt/arch.h
@@ -330,6 +330,7 @@ static OPUS_INLINE int celt_isnan(float x)
 #define SUB32(a,b) ((a)-(b))
 #define ADD32_ovflw(a,b) ((a)+(b))
 #define SUB32_ovflw(a,b) ((a)-(b))
+#define SHL32_ovflw(a,shift) (a)
 #define PSHR32_ovflw(a,shift) (a)
 
 #define MULT16_16_16(a,b)     ((a)*(b))
diff --git a/celt/fixed_debug.h b/celt/fixed_debug.h
index 4b92a1e3..a879ec37 100644
--- a/celt/fixed_debug.h
+++ b/celt/fixed_debug.h
@@ -69,6 +69,8 @@ extern opus_int64 celt_mips;
 /* Avoid MSVC warning C4146: unary minus operator applied to unsigned type */
 /** Negate 32-bit value, ignore any overflows */
 #define NEG32_ovflw(a) (celt_mips+=2,(opus_val32)(0-(opus_uint32)(a)))
+/** 32-bit shift left, ignoring overflows */
+#define SHL32_ovflw(a,shift) ((opus_int32)((opus_uint32)(a)<<(shift)))
 /** 32-bit arithmetic shift right with rounding-to-nearest, ignoring overflows */
 #define PSHR32_ovflw(a,shift) (SHR32(ADD32_ovflw(a, (EXTEND32(1)<<(shift)>>1)),shift))
 
diff --git a/celt/fixed_generic.h b/celt/fixed_generic.h
index 3de7bd6a..a4834df5 100644
--- a/celt/fixed_generic.h
+++ b/celt/fixed_generic.h
@@ -147,6 +147,8 @@
 /* Avoid MSVC warning C4146: unary minus operator applied to unsigned type */
 /** Negate 32-bit value, ignore any overflows */
 #define NEG32_ovflw(a) ((opus_val32)(0-(opus_uint32)(a)))
+/** 32-bit shift left, ignoring overflows */
+#define SHL32_ovflw(a,shift) SHL32(a,shift)
 /** 32-bit arithmetic shift right with rounding-to-nearest, ignoring overflows */
 #define PSHR32_ovflw(a,shift) (SHR32(ADD32_ovflw(a, (EXTEND32(1)<<(shift)>>1)),shift))
 
diff --git a/celt/mdct.c b/celt/mdct.c
index ba6b22eb..b03e8a21 100644
--- a/celt/mdct.c
+++ b/celt/mdct.c
@@ -297,8 +297,8 @@ void clt_mdct_backward_c(const mdct_lookup *l, kiss_fft_scalar *in, kiss_fft_sca
          kiss_fft_scalar yr, yi;
          opus_val32 x1, x2;
          rev = *bitrev++;
-         x1 = SHL32(*xp1, IMDCT_HEADROOM);
-         x2 = SHL32(*xp2, IMDCT_HEADROOM);
+         x1 = SHL32_ovflw(*xp1, IMDCT_HEADROOM);
+         x2 = SHL32_ovflw(*xp2, IMDCT_HEADROOM);
          yr = ADD32_ovflw(S_MUL(x2, t[i]), S_MUL(x1, t[N4+i]));
          yi = SUB32_ovflw(S_MUL(x1, t[i]), S_MUL(x2, t[N4+i]));
          /* We swap real and imag because we use an FFT instead of an IFFT. */