diff --git a/src/sleef.jl b/src/sleef.jl
index 865fb22..1aebf6d 100644
--- a/src/sleef.jl
+++ b/src/sleef.jl
@@ -339,7 +339,8 @@ end
 # end
 
 @static if Base.libllvm_version ≥ v"9"
-    @static if SIMDPirates.VectorizationBase.AVX & SIMDPirates.VectorizationBase.FMA
+    @static if SIMDPirates.VectorizationBase.FMA & (SIMDPirates.VectorizationBase.REGISTER_SIZE ≥ 32) # In earlier Julia versions, AVX will not be defined
+        # SIMDPirates.VectorizationBase.AVX & 
         @inline function tanh(v::Vec{8,Float32})
             Base.llvmcall(("""
 declare i32 @llvm.x86.avx.vtestz.ps.256(<8 x float>, <8 x float>) #16
diff --git a/src/xsimd.jl b/src/xsimd.jl
index ad5ef76..be931d0 100644
--- a/src/xsimd.jl
+++ b/src/xsimd.jl
@@ -90,7 +90,7 @@ if Sys.ARCH === :x86_64
     end
 end
 
-if SIMDPirates.VectorizationBase.AVX
+if Sys.ARCH === :x86_64 && SIMDPirates.VectorizationBase.REGISTER_SIZE ≥ 32 # In earlier Julia versions, AVX will not be defined
     @inline function Base.expm1(v::SVec{4,Float64})
         SVec(Base.llvmcall(("""
                 declare <4 x double> @llvm.fmuladd.v4f64(<4 x double>, <4 x double>, <4 x double>)