diff --git a/litex/build/altera/quartus.py b/litex/build/altera/quartus.py
index ef6b505b0c..8225bf3a7b 100644
--- a/litex/build/altera/quartus.py
+++ b/litex/build/altera/quartus.py
@@ -14,6 +14,7 @@
 from shutil import which
 
 from migen.fhdl.structure import _Fragment
+from migen.fhdl.simplify import FullMemoryWE
 
 from litex.build.generic_platform import Pins, IOStandard, Misc
 from litex.build.generic_toolchain import GenericToolchain
@@ -39,6 +40,9 @@ def build(self, platform, fragment,
 
         self._synth_tool = synth_tool
 
+        # Apply FullMemoryWE on Design (Quartus does not infer memories correctly otherwise).
+        FullMemoryWE()(fragment)
+
         return GenericToolchain.build(self, platform, fragment, **kwargs)
 
     # IO/Placement Constraints (.qsf) --------------------------------------------------------------