diff --git a/SWCompression.podspec b/SWCompression.podspec
index e2f73606..1ae59567 100644
--- a/SWCompression.podspec
+++ b/SWCompression.podspec
@@ -52,13 +52,13 @@ Pod::Spec.new do |s|
   s.subspec 'BZip2' do |sp|
     sp.dependency 'SWCompression/Common'
     sp.source_files = 'Sources/{BZip2.swift,HuffmanTree.swift,BitToByteWriter.swift}'
-    sp.compiler_flags = '-DSWCOMP_ZIP_POD_BZ2'
+    sp.pod_target_xcconfig = { 'OTHER_SWIFT_FLAGS' => '-DSWCOMP_ZIP_POD_BZ2' }
   end
 
   s.subspec 'LZMA' do |sp|
     sp.dependency 'SWCompression/Common'
     sp.source_files = 'Sources/LZMA*.swift'
-    sp.compiler_flags = '-DSWCOMP_ZIP_POD_LZMA'
+    sp.pod_target_xcconfig = { 'OTHER_SWIFT_FLAGS' => '-DSWCOMP_ZIP_POD_LZMA' }
   end
 
   s.subspec 'XZ' do |sp|
@@ -71,7 +71,7 @@ Pod::Spec.new do |s|
     sp.dependency 'SWCompression/Common'
     sp.dependency 'SWCompression/Deflate'
     sp.source_files = 'Sources/ZipContainer.swift'
-    sp.compiler_flags = '-DSWCOMP_ZIP_POD_BUILD'
+    sp.pod_target_xcconfig = { 'OTHER_SWIFT_FLAGS' => '-DSWCOMP_ZIP_POD_BUILD' }
   end
 
 end